Tian J

References (31)

Title : Artificial antibody-antigen-directed immobilization of lipase for consecutive catalytic synthesis of ester: Benzyl acetate case study - Yang_2024_Bioresour.Technol_403_130894
Author(s) : Yang Y , Guo M , Guo S , Tian J , Gu D
Ref : Bioresour Technol , 403 :130894 , 2024
Abstract : A strategy based on artificial antibody-antigen recognition was proposed for the specific directed immobilization of lipase. The artificial antibody was synthesized using catechol as a template, alpha-methacrylic acid as a functional monomer, and Fe(3)O(4) as the matrix material. Lipase was modified with 3,4-dihydroxybenzaldehyde as an artificial antigen. The artificial antibody can specifically recognize catechol fragment in the enzyme structure to achieve the immobilization of lipase. The immobilization amount, yield, specific activity, and immobilized enzyme activity were 13.2 +/- 0.2 mg/g, 78.9 +/- 0.4 %, 7.9 +/- 0.2 U/mg(protein), and 104.6 +/- 1.7 U/g(carrier), respectively. Moreover, the immobilized lipase exhibited strong reusability and regeneration ability. Additionally, the immobilized lipase successfully catalyzed the synthesis of benzyl acetate and demonstrated robust continuous catalytic activity. These results fully demonstrate the feasibility of the proposed artificial antibody-antigen-directed immobilization of lipase.
ESTHER : Yang_2024_Bioresour.Technol_403_130894
PubMedSearch : Yang_2024_Bioresour.Technol_403_130894
PubMedID: 38795924

Title : A randomized, double-blind, placebo controlled, phase 3 trial to evaluate the efficacy and safety of cetagliptin added to ongoing metformin therapy in patients with uncontrolled type 2 diabetes with metformin monotherapy - Ji_2023_Diabetes.Obes.Metab_25_3788
Author(s) : Ji L , Lu J , Gao L , Yan X , Li J , Cheng Z , Zhang L , Tian J , Li P , Bai J , Xie D , Zhao J , Ding J , Yu Q , Wang T
Ref : Diabetes Obes Metab , 25 :3788 , 2023
Abstract : AIM: This trial was designed to assess the efficacy and safety of cetagliptin added to metformin in Chinese patients with type 2 diabetes who had inadequate glycaemic control with metformin monotherapy. METHODS: In total, 446 patients with type 2 diabetes on metformin monotherapy were randomized to receive the addition of once-daily cetagliptin 100mg, cetagliptin 50mg and placebo in a 2:2:1 ratio for 24-week double-blind treatment. At week 24, patients initially randomized to cetagliptin 50mg and placebo were switched to cetagliptin 100mg for 28weeks open-label treatment. The primary endpoint was the change in haemoglobin A1c (HbA1c) from baseline, and the efficacy analyses were based on an all-patients-treated population using an analysis of co-variance. RESULTS: After 24weeks, both add-on therapies led to greater glycaemic control. Reductions in HbA1c from baseline were -1.17+/-0.794%, -1.23+/-0.896% in cetagliptin 100mg and 50mg plus metformin group, respectively. No difference was observed between the cetagliptin 100mg and 50mg plus metformin group. Patients with higher baseline HbA1c levels (<=8.5%) experienced greater reductions in HbA1c. A significantly greater proportion of patients achieved an HbA1c <7.0% with cetagliptin 100mg (49.4%) and cetagliptin 50mg (51.1%) plus metformin than metformin monotherapy (14.4%). Both combination therapies also improved the homeostasis model assessment beta-function index and decreased systolic blood pressure. There was no increased risk of adverse effects with combination therapy, and both combination therapies were generally well tolerated. CONCLUSIONS: The addition of cetagliptin once daily to metformin was more efficacious and well tolerated than metformin monotherapy in Chinese patients with type 2 diabetes who had inadequate glycaemic control with metformin monotherapy.
ESTHER : Ji_2023_Diabetes.Obes.Metab_25_3788
PubMedSearch : Ji_2023_Diabetes.Obes.Metab_25_3788
PubMedID: 37724698

Title : OsGELP77, a QTL for broad-spectrum disease resistance and yield in rice, encodes a GDSL-type lipase - Zhang_2023_Plant.Biotechnol.J__
Author(s) : Zhang M , Chen D , Tian J , Cao J , Xie K , He Y , Yuan M
Ref : Plant Biotechnol J , : , 2023
Abstract : Lipids and lipid metabolites have essential roles in plant-pathogen interactions. GDSL-type lipases are involved in lipid metabolism modulating lipid homeostasis. Some plant GDSLs modulate lipid metabolism altering hormone signal transduction to regulate host-defence immunity. Here, we functionally characterized a rice lipase, OsGELP77, promoting both immunity and yield. OsGELP77 expression was induced by pathogen infection and jasmonic acid (JA) treatment. Overexpression of OsGELP77 enhanced rice resistance to both bacterial and fungal pathogens, while loss-of-function of osgelp77 showed susceptibility. OsGELP77 localizes to endoplasmic reticulum and is a functional lipase hydrolysing universal lipid substrates. Lipidomics analyses demonstrate that OsGELP77 is crucial for lipid metabolism and lipid-derived JA homeostasis. Genetic analyses confirm that OsGELP77-modulated resistance depends on JA signal transduction. Moreover, population genetic analyses indicate that OsGELP77 expression level is positively correlated with rice resistance against pathogens. Three haplotypes were classified based on nucleotide polymorphisms in the OsGELP77 promoter where OsGELP77(Hap3) is an elite haplotype. Three OsGELP77 haplotypes are differentially distributed in wild and cultivated rice, while OsGELP77(Hap3) has been broadly pyramided for hybrid rice development. Furthermore, quantitative trait locus (QTL) mapping and resistance evaluation of the constructed near-isogenic line validated OsGELP77, a QTL for broad-spectrum disease resistance. In addition, OsGELP77-modulated lipid metabolism promotes JA accumulation facilitating grain yield. Notably, the hub defence regulator OsWRKY45 acts upstream of OsGELP77 by initiating the JA-dependent signalling to trigger immunity. Together, OsGELP77, a QTL contributing to immunity and yield, is a candidate for breeding broad-spectrum resistant and high-yielding rice.
ESTHER : Zhang_2023_Plant.Biotechnol.J__
PubMedSearch : Zhang_2023_Plant.Biotechnol.J__
PubMedID: 38100249

Title : Rational redesign of thermophilic PET hydrolase LCCICCG to enhance hydrolysis of high crystallinity polyethylene terephthalates - Ding_2023_J.Hazard.Mater_453_131386
Author(s) : Ding Z , Xu G , Miao R , Wu N , Zhang W , Yao B , Guan F , Huang H , Tian J
Ref : J Hazard Mater , 453 :131386 , 2023
Abstract : Polyethylene terephthalate (PET)-degrading enzymes represent a promising solution to the plastic pollution. However, PET-degrading enzymes, even thermophilic PETase, can effectively degrade low-crystallinity (-8%) PETs, but exhibit weak depolymerization of more common, high-crystallinity (30-50%) PETs. Here, based on the thermophilic PETase, LCCICCG, we proposed two strategies for rational redesign of LCCICCG using the machine learning tool, Preoptem, combined with evolutionary analysis. Six single-point mutants (S32L, D18T, S98R, T157P, E173Q, N213P) were obtained that exhibit higher catalytic efficiency towards PET powder than wild-type LCCICCG at 75 degreesC. Additionally, the optimal temperature for degrading 39.07% crystalline PET increased from 65 degreesC in the wild-type LCCICCG to between 75 and 80 degreesC in the LCCICCG_I6M mutant that carries all six single-point mutations. Especially, the LCCICCG_I6M mutant has a significantly higher degradation effect on some commonly used bottle-grade plastic powders at 75-80 degreesC than that of wild type. The enzymatic digestion of ground 31.30% crystalline PET water bottles by LCCICCG_I6M yielded 31.91 +/- 0.99 mM soluble products in 24 h, which was 3.64 times that of LCCICCG (8.77 +/- 1.52 mM). Overall, this study provides a feasible route for engineering thermostable enzymes that can degrade high-crystallinity PET plastic.
ESTHER : Ding_2023_J.Hazard.Mater_453_131386
PubMedSearch : Ding_2023_J.Hazard.Mater_453_131386
PubMedID: 37043849
Gene_locus related to this paper: 9bact-g9by57

Title : Analyses of the autism-associated neuroligin-3 R451C mutation in human neurons reveal a gain-of-function synaptic mechanism - Wang_2022_Mol.Psychiatry__
Author(s) : Wang L , Mirabella VR , Dai R , Su X , Xu R , Jadali A , Bernabucci M , Singh I , Chen Y , Tian J , Jiang P , Kwan KY , Pak C , Liu C , Comoletti D , Hart RP , Chen C , Sudhof TC , Pang ZP
Ref : Mol Psychiatry , : , 2022
Abstract : Mutations in many synaptic genes are associated with autism spectrum disorders (ASD), suggesting that synaptic dysfunction is a key driver of ASD pathogenesis. Among these mutations, the R451C substitution in the NLGN3 gene that encodes the postsynaptic adhesion molecule Neuroligin-3 is noteworthy because it was the first specific mutation linked to ASDs. In mice, the corresponding Nlgn3 R451C-knockin mutation recapitulates social interaction deficits of ASD patients and produces synaptic abnormalities, but the impact of the NLGN3 R451C mutation on human neurons has not been investigated. Here, we generated human knockin neurons with the NLGN3 R451C and NLGN3 null mutations. Strikingly, analyses of NLGN3 R451C-mutant neurons revealed that the R451C mutation decreased NLGN3 protein levels but enhanced the strength of excitatory synapses without affecting inhibitory synapses; meanwhile NLGN3 knockout neurons showed reduction in excitatory synaptic strengths. Moreover, overexpression of NLGN3 R451C recapitulated the synaptic enhancement in human neurons. Notably, the augmentation of excitatory transmission was confirmed in vivo with human neurons transplanted into mouse forebrain. Using single-cell RNA-seq experiments with co-cultured excitatory and inhibitory NLGN3 R451C-mutant neurons, we identified differentially expressed genes in relatively mature human neurons corresponding to synaptic gene expression networks. Moreover, gene ontology and enrichment analyses revealed convergent gene networks associated with ASDs and other mental disorders. Our findings suggest that the NLGN3 R451C mutation induces a gain-of-function enhancement in excitatory synaptic transmission that may contribute to the pathophysiology of ASD.
ESTHER : Wang_2022_Mol.Psychiatry__
PubMedSearch : Wang_2022_Mol.Psychiatry__
PubMedID: 36280753

Title : Computational design of a cutinase for plastic biodegradation by mining molecular dynamics simulations trajectories - Li_2022_Comput.Struct.Biotechnol.J_20_459
Author(s) : Li Q , Zheng Y , Su T , Wang Q , Liang Q , Zhang Z , Qi Q , Tian J
Ref : Comput Struct Biotechnol J , 20 :459 , 2022
Abstract : Polyethylene terephthalate (PET) has caused serious environmental concerns but could be degraded at high temperature. Previous studies show that cutinase from Thermobifida fusca KW3 (TfCut2) is capable of degrading and upcycling PET but is limited by its thermal stability. Nowadays, Popular protein stability modification methods rely mostly on the crystal structures, but ignore the fact that the actual conformation of protein is complex and constantly changing. To solve these problems, we developed a computational approach to design variants with enhanced protein thermal stability by mining Molecular Dynamics simulation trajectories using Machine Learning methods (MDL). The optimal classification accuracy and the optimal Pearson correlation coefficient of MDL model were 0.780 and 0.716, respectively. And we successfully designed variants with high deltaT (m) values using MDL method. The optimal variant S121P/D174S/D204P had the highest deltaT (m) value of 9.3 degreesC, and the PET degradation ratio increased by 46.42-fold at 70 degC, compared with that of wild type TfCut2. These results deepen our understanding on the complex conformations of proteins and may enhance the plastic recycling and sustainability at glass transition temperature.
ESTHER : Li_2022_Comput.Struct.Biotechnol.J_20_459
PubMedSearch : Li_2022_Comput.Struct.Biotechnol.J_20_459
PubMedID: 35070168
Gene_locus related to this paper: thefu-q6a0i3

Title : Ensemble machine learning to evaluate the in vivo acute oral toxicity and in vitro human acetylcholinesterase inhibitory activity of organophosphates - Wang_2021_Arch.Toxicol__
Author(s) : Wang L , Ding J , Shi P , Fu L , Pan L , Tian J , Cao D , Jiang H , Ding X
Ref : Archives of Toxicology , : , 2021
Abstract : Organophosphates (OPs) are hazardous chemicals widely used in industry and agriculture. Distribution of their residues in nature causes serious risks to humans, animals, and plants. To reduce hazards from OPs, quantitative structure-activity relationship (QSAR) models for predicting their acute oral toxicity in rats and mice and inhibition constants concerning human acetylcholinesterase were developed according to the bioactivity data of 456 unique OPs. Based on robust, two-dimensional molecular descriptors and quantum chemical descriptors, which accurately reflect OP electronic structures and reactivities, the influences of eight machine-learning algorithms on the prediction performance of the QSAR models were explored, and consensus QSAR models were constructed. Several strict model validation indices and the results of applicability domain evaluations show that the established consensus QSAR models exhibit good robustness, practical prediction abilities, and wide application scopes. Poor correlation was observed between acute oral toxicity at the mammalian level and the inhibition constants at the molecular level, indicating that the acute toxicity of OPs cannot be evaluated only by the experimental data of enzyme inhibitory activity, their toxicokinetic characteristics must also be considered. The constructed QSAR models described herein provide rapid, theoretical assessment of the bioactivity of unstudied or unknown OPs, as well as guidance for making decisions regarding their regulation.
ESTHER : Wang_2021_Arch.Toxicol__
PubMedSearch : Wang_2021_Arch.Toxicol__
PubMedID: 33934188

Title : Hydrogen-bonded lipase-hydrogel microspheres for esterification application - Qin_2021_J.Colloid.Interface.Sci_606_1229
Author(s) : Qin Z , Feng N , Li Y , Fei X , Tian J , Xu L , Wang Y
Ref : J Colloid Interface Sci , 606 :1229 , 2021
Abstract : Lipase is the most widely used enzyme in industry. Due to its unique "lid" structure, lipase can only show high activity at the oil-water interface, which means that water is needed in the catalytic esterification process. However, the traditional lipase catalytic system cannot effectively control "micro-water" in the esterification environment, resulting in the high content of free water, which hinders the esterification reaction and reduces the yield. In this paper, a promising strategy of esterification catalyzed by polyacrylamide hydrogel immobilized lipase is reported. The porous polyacrylamide hydrogel microspheres (PHM) prepared by inverse emulsion polymerization are used as carrier to adsorb lipase by hydrogen bonding interaction. These hydrogel microspheres provide a "micro-water environment" for lipase in the anhydrous reaction system, and further provide an oil-water interface for "interface activation" of lipase. The obtained lipase-porous polyacrylamide hydrogel microspheres (L-PHMs) exhibit higher temperature and pH stability compared with free lipase, and the optimum enzymatic activity reach 1350 U/g (pH 6, 40 degreesC). L-PHMs can still remain about 49% of their original activity after 20 reuses. Furthermore, L-PHMs have been successfully applied to catalyze the synthesis of conjugated linoleic acid ethyl ester. The results suggest that this immobilization method opens up a new way for the application of lipase in ester synthesis.
ESTHER : Qin_2021_J.Colloid.Interface.Sci_606_1229
PubMedSearch : Qin_2021_J.Colloid.Interface.Sci_606_1229
PubMedID: 34492461

Title : Protein engineering of stable IsPETase for PET plastic degradation by Premuse - Meng_2021_Int.J.Biol.Macromol_180_667
Author(s) : Meng X , Yang L , Liu H , Li Q , Xu G , Zhang Y , Guan F , Zhang W , Wu N , Tian J
Ref : Int J Biol Macromol , 180 :667 , 2021
Abstract : Poly(ethylene terephthalate) (PET) is used widely by human beings, but is very difficult to degrade. Up to now, the PET degradation effect of PETase from Ideonella sakaiensis 201-F6 (IsPETase) variants with low stability and activity was not ideal. In this study, a mutation design tool, Premuse, was developed to integrate the sequence alignment and quantitative selection of the preferred mutations based on natural sequence evolution. Ten single point mutants were selected from 1486 homologous sequences using Premuse, and then two mutations (W159H and F229Y) with improved stability were screened from them. The derived double point mutant, W159H/F229Y, exhibited a strikingly enhanced enzymatic performance. Its T(m) and catalytic efficiency values (k(cat)/K(m)) respectively increased by 10.4 degreesC and 2.0-fold using p-NPP as the substrate compared with wild type. The degradation activity for amorphous PET was increased by almost 40-fold in comparison with wild type at 40 degreesC in 24 h. Additionally, the variant could catalyze biodegradation of PET bottle preform at a mean rate of 23.4 mg(PET)/h/mg(enzyme). This study allowed us to design the mutation more efficiently, and provides a tool for achieving biodegradation of PET pollution under mild natural environments.
ESTHER : Meng_2021_Int.J.Biol.Macromol_180_667
PubMedSearch : Meng_2021_Int.J.Biol.Macromol_180_667
PubMedID: 33753197
Gene_locus related to this paper: idesa-peth

Title : GAPT regulates cholinergic dysfunction and oxidative stress in the brains of learning and memory impairment mice induced by scopolamine - Liu_2020_Brain.Behav__e01602
Author(s) : Liu Z , Qin G , Mana L , Dong Y , Huang S , Wang Y , Wu Y , Shi J , Tian J , Wang P
Ref : Brain Behav , :e01602 , 2020
Abstract : BACKGROUND: Cholinergic dysfunction and oxidative stress are the crucial mechanisms of Alzheimer's disease (AD). GAPT, also called GEPT (a combination of several active components extracted from the Chinese herbs ginseng, epimedium, polygala and tuber curcumae) or Jinsiwei, is a patented Chinese herbal compound, has been clinically widely used to improve learning and memory impairment, but whether it can play a neuroprotective role by protecting cholinergic neurons and reducing oxidative stress injury remains unclear. METHODS: Male ICR mice were intraperitoneally injected with scopolamine (3 mg/kg) to establish a learning and memory disordered model. An LC-MS method was established to study the chemical compounds and in vivo metabolites of GAPT. After scopolamine injection, a step-down passive-avoidance test (SDPA) and a Y maze test were used to estimate learning ability and cognitive function. In addition, ELISA detected the enzymatic activities of acetylcholinesterase (AChE), acetylcholine (ACh), choline acetyltransferase (ChAT), malondialdehyde (MDA), glutathione peroxidase (GPX), and total superoxide dismutase (T-SOD). The protein expressions of AChE, ChAT, SOD1, and GPX1 were observed by western blot, and the distribution of ChAT, SOD1, and GPX1 was observed by immunohistochemical staining. RESULTS: After one-half or 1 month of intragastric administration, GAPT can ameliorate scopolamine-induced behavioral changes in learning and memory impaired mice. It can also decrease the activity of MDA and protein expression level of AChE, increase the activity of Ach, and increase activity and protein expression level of ChAT, SOD, and GPX in scopolamine-treated mice. After one and a half month of intragastric administration of GAPT, echinacoside, salvianolic acid A, ginsenoside Rb1, ginsenoside Rg2, pachymic acid, and beta asarone could be absorbed into mice blood and pass through BBB. CONCLUSIONS: GAPT can improve the learning and memory ability of scopolamine-induced mice, and its mechanism may be related to protecting cholinergic neurons and reducing oxidative stress injury.
ESTHER : Liu_2020_Brain.Behav__e01602
PubMedSearch : Liu_2020_Brain.Behav__e01602
PubMedID: 32174034

Title : Enhancing secretion of polyethylene terephthalate hydrolase PETase in Bacillus subtilis WB600 mediated by the SP(amy) signal peptide - Wang_2020_Lett.Appl.Microbiol__
Author(s) : Wang N , Guan F , Lv X , Han D , Zhang Y , Wu N , Xia X , Tian J
Ref : Lett Appl Microbiol , : , 2020
Abstract : The polyethylene terephthalate hydrolase (PETase) has been proved to have a high activity to degrade polyethylene terephthalate (PET), but few studies have been carried on its secretion in Bacillus subtilis. In this study, the coding gene of PETase, which was isolated from the Ideonella sakaiensis, was synthesized and expressed in B. subtilis. Then, we evaluated the ability of five Bacillus signal peptides to enhance PETase secretion by B. subtilis. The results indicated that the SP(amy) -induced secretion of PETase was the highest, and its activity against p-Nitrophenyl palmitate was about fourfold that of the natural signal peptide SP(PETase) . The weak promoter P43 provided sufficient time for translation and folding of PETase, resulting in increased extracellular expression. Use of P43 and SP(amy) in combination yielded the greatest bis-(2-hydroxyethyl) terephthalate degradation and PET-film etching activity due to maximized secretion of PETase by B. subtilis. Our findings will facilitate biodegradation of PET plastic.
ESTHER : Wang_2020_Lett.Appl.Microbiol__
PubMedSearch : Wang_2020_Lett.Appl.Microbiol__
PubMedID: 32394501

Title : Selenoprotein F knockout leads to glucose and lipid metabolism disorders in mice - Zheng_2020_J.Biol.Inorg.Chem_25_1009
Author(s) : Zheng X , Ren B , Li X , Yan H , Xie Q , Liu H , Zhou J , Tian J , Huang K
Ref : J Biol Inorg Chem , 25 :1009 , 2020
Abstract : Selenoprotein F (Selenof), an endoplasmic reticulum (ER)-resident protein, is considered to be involved in glycoprotein folding and quality control in the ER. However, its function has not yet been thoroughly addressed. In this study, proteomics analysis revealed that Selenof deficiency in mice led to the differential expression of hepatic proteins associated with glucose and lipid metabolism. The phenotype analysis revealed that Selenof knockout mice showed glucose intolerance and insulin reduction, even with a normal diet. Additionally, Selenof knockout exacerbated high-fat diet-induced obesity, hyperglycemia, glucose intolerance, and hepatic steatosis. Furthermore, lipoprotein lipase and carboxylesterase 1D, two glycoproteins involved in lipid metabolism, were significantly decreased in the liver of Selenof knockout mice with a normal or high-fat diet. Collectively, these findings suggested that Selenof deficiency might cause the perturbation of glycoprotein quality control and thus contribute to glucose and lipid metabolism disorders, implying a novel biological function of Selenof.
ESTHER : Zheng_2020_J.Biol.Inorg.Chem_25_1009
PubMedSearch : Zheng_2020_J.Biol.Inorg.Chem_25_1009
PubMedID: 32995962

Title : Central cholinergic neuronal degeneration promotes the development of postoperative cognitive dysfunction - Xu_2019_Lab.Invest_99_1078
Author(s) : Xu H , Chen L , Zhang X , Jiang X , Tian W , Yu W , Wang X , Tian J , Su D
Ref : Lab Invest , 99 :1078 , 2019
Abstract : Postoperative cognitive dysfunction (POCD) is consistently associated with increased morbidity and mortality. However, its mechanism remains poorly understood. We hypothesized that central cholinergic neuronal degeneration facilitates the development of POCD. The impact of anesthesia/surgery (appendectomy) on learning and memory and the levels of choline acetyltransferase (ChAT), acetylcholinesterase (AChE), vesicular acetylcholine transporter (VAChT), and choline transporter (CHT) in adult and aged mice were measured. Separate cohorts were analyzed after pretreatment with donepezil, an AChE inhibitor, in aged mice or with murine-p75-saporin (mu-p75-sap), a cholinergic-specific immunotoxin, in adult mice. Morris Water Maze was used to measure the learning and memory changes after anesthesia/surgery. Western blot was used to measure the changes in the protein levels of the biomarkers of the central cholinergic system. We found that anesthesia/surgery-induced memory decline and attenuation of central cholinergic biomarkers (ChAT and VAChT) in aged mice but not in adult mice. Donepezil pretreatment reduced central cholinergic impairment in the aged mice and prevented learning and memory declines after anesthesia/surgery. In contrast, when central cholinergic neurons were pre-injured with mu-p75-sap, cognitive dysfunction developed in the adult mice after anesthesia/surgery. These data suggest that central cholinergic neuronal degeneration facilitates the development of POCD.
ESTHER : Xu_2019_Lab.Invest_99_1078
PubMedSearch : Xu_2019_Lab.Invest_99_1078
PubMedID: 30626892

Title : Central cholinergic system mediates working memory deficit induced by anesthesia\/surgery in adult mice - Zhang_2018_Brain.Behav_8_e00957
Author(s) : Zhang X , Jiang X , Huang L , Tian W , Chen X , Gu X , Yu W , Tian J , Su D
Ref : Brain Behav , 8 :e00957 , 2018
Abstract : Background: Postoperative cognitive dysfunction (POCD) is consistently associated with increased morbidity and mortality, which has become a major concern of patients and caregivers. Although POCD occurs mainly in aged patients, it happens at any age. Previous studies demonstrated that anesthesia/surgery had no effects on reference memory of adult mice. However, whether it impairs working memory remains unclear. Working memory deficit would result in many deficits of executive function. We hypothesized that anesthesia/surgery impaired the working memory of adult mice and the central cholinergic system was involved. Method: Tibial fracture internal fixation under the anesthesia of isoflurane was performed in two-month-old C57BL/6 mice. Two days later, the spatial reference memory and working memory were measured by a Morris Water Maze (MWM). Donepezil, an inhibitor of acetylcholinesterase (AChE), was administered in another cohort mice for 4 weeks. Then, the working memory was measured by MWM 2 days after anesthesia/surgery. Western blot was used to detect the protein levels of acetylcholine transferase (ChAT), AChE, vesicular acetylcholine transporter (VAChT), and choline transporter (ChT) in the prefrontal cortex (PFC). Results: We found that anesthesia/surgery had no effects on the reference memory, but it impaired the working memory in adult mice. Meanwhile, we also found that the protein level of ChAT in PFC decreased significantly compared with that in control group. Donepezil pretreatment prevented working memory impairment and the decrease of the protein levels of ChAT induced by anesthesia/surgery. Conclusion: These results suggest that anesthesia/surgery leads to working memory deficits in adult mice and central cholinergic system impairment is involved.
ESTHER : Zhang_2018_Brain.Behav_8_e00957
PubMedSearch : Zhang_2018_Brain.Behav_8_e00957
PubMedID: 29761010

Title : Genomic Analysis of Microbulbifer sp. Strain A4B-17 and the Characterization of Its Metabolic Pathways for 4-Hydroxybenzoic Acid Synthesis - Tian_2018_Front.Microbiol_9_3115
Author(s) : Tian J , Zhu L , Wang W , Zhang L , Li Z , Zhao Q , Xing K , Feng Z , Peng X
Ref : Front Microbiol , 9 :3115 , 2018
Abstract : The marine bacterium Microbulbifer sp. A4B-17 produces secondary metabolites such as 4-hydroxybenzoic acid (4HBA) and esters of 4HBA (parabens). 4HBA is a useful material in the synthesis of the liquid crystal. Parabens are man-made compounds that have been extensively used since the 1920s in the cosmetic, pharmaceutical, and food industries for their effective antimicrobial activity. In this study, we completed the sequencing and annotation of the A4B-17 strain genome and found all genes for glucose utilization and 4HBA biosynthesis. Strain A4B-17 uses the Embden-Meyerhof-Parnas (EMP), hexose monophosphate (HMP), and Entner-Doudoroff (ED) pathways to utilize glucose. Other sugars such as fructose, sucrose, xylose, arabinose, galactose, mannitol, and glycerol supported cell growth and 4HBA synthesis. Reverse transcriptional analysis confirmed that the key genes involved in the glucose metabolism were functional. Paraben concentrations were proportionally increased by adding alcohols to the culture medium, indicating that strain A4B-17 synthesizes the 4HBA and the alcohols separately and an esterification reaction between them is responsible for the paraben synthesis. A gene that codes for a carboxylesterase was proposed to catalyze this reaction. The temperature and NaCl concentration for optimal growth were determined to be 35 degrees C and 22.8 g/L.
ESTHER : Tian_2018_Front.Microbiol_9_3115
PubMedSearch : Tian_2018_Front.Microbiol_9_3115
PubMedID: 30619190

Title : Dietary phosphatidylcholine impacts on growth performance and lipid metabolism in adult Genetically Improved Farmed Tilapia (GIFT) strain of Nile tilapia Oreochromis niloticus - Tian_2017_Br.J.Nutr__1
Author(s) : Tian J , Wen H , Lu X , Liu W , Wu F , Yang CG , Jiang M , Yu LJ
Ref : British Journal of Nutrition , :1 , 2017
Abstract : This study aimed to determine the effects of supplementing the diet of adult Nile tilapia Oreochromis niloticus with phosphatidylcholine (PC) on growth performance, body composition, fatty acid composition and gene expression. Genetically Improved Farmed Tilapia fish with an initial body weight of 83.1 (sd 2.9) g were divided into six groups. Each group was hand-fed a semi-purified diet containing 1.7 (control diet), 4.0, 6.5, 11.5, 21.3 or 41.0 g PC/kg diet for 68 d. Supplemental PC improved the feed efficiency rate, which was highest in the 11.5 g PC/kg diet. Weight gain and specific growth rate were unaffected. Dietary PC increased PC content in the liver and decreased crude fat content in the liver, viscera and body. SFA and MUFA increased and PUFA decreased in muscle with increasing dietary PC. Cytoplasmic phospholipase A 2 and secreted phospholipase A 2 mRNA expression were up-regulated in the brain and heart in PC-supplemented fish. PC reduced fatty acid synthase mRNA expression in the liver and visceral tissue but increased expression in muscle. Hormone-sensitive lipase and lipoprotein lipase expression increased in the liver with increasing dietary PC. Growth hormone mRNA expression was reduced in the brain and insulin-like growth factor-1 mRNA expression in liver reduced with PC above 6.5 g/kg. Our results demonstrate that dietary supplementation with PC improves feed efficiency and reduces liver fat in adult Nile tilapia, without increasing weight gain, representing a novel dietary approach to reduce feed requirements and improve the health of Nile tilapia.
ESTHER : Tian_2017_Br.J.Nutr__1
PubMedSearch : Tian_2017_Br.J.Nutr__1
PubMedID: 29227215

Title : Karyotype Stability and Unbiased Fractionation in the Paleo-Allotetraploid Cucurbita Genomes - Sun_2017_Mol.Plant_10_1293
Author(s) : Sun H , Wu S , Zhang G , Jiao C , Guo S , Ren Y , Zhang J , Zhang H , Gong G , Jia Z , Zhang F , Tian J , Lucas WJ , Doyle JJ , Li H , Fei Z , Xu Y
Ref : Mol Plant , 10 :1293 , 2017
Abstract : The Cucurbita genus contains several economically important species in the Cucurbitaceae family. Here, we report high-quality genome sequences of C. maxima and C. moschata and provide evidence supporting an allotetraploidization event in Cucurbita. We are able to partition the genome into two homoeologous subgenomes based on different genetic distances to melon, cucumber, and watermelon in the Benincaseae tribe. We estimate that the two diploid progenitors successively diverged from Benincaseae around 31 and 26 million years ago (Mya), respectively, and the allotetraploidization happened at some point between 26 Mya and 3 Mya, the estimated date when C. maxima and C. moschata diverged. The subgenomes have largely maintained the chromosome structures of their diploid progenitors. Such long-term karyotype stability after polyploidization has not been commonly observed in plant polyploids. The two subgenomes have retained similar numbers of genes, and neither subgenome is globally dominant in gene expression. Allele-specific expression analysis in the C. maxima x C. moschata interspecific F(1) hybrid and their two parents indicates the predominance of trans-regulatory effects underlying expression divergence of the parents, and detects transgressive gene expression changes in the hybrid correlated with heterosis in important agronomic traits. Our study provides insights into polyploid genome evolution and valuable resources for genetic improvement of cucurbit crops.
ESTHER : Sun_2017_Mol.Plant_10_1293
PubMedSearch : Sun_2017_Mol.Plant_10_1293
PubMedID: 28917590
Gene_locus related to this paper: cucma-a0a6j1jlb1 , cucma-a0a6j1i8e2 , cucma-a0a6j1hwl6

Title : Pathogenicity of Isaria fumosorosea to Bemisia tabaci, with some observations on the fungal infection process and host immune response - Tian_2015_J.Invertebr.Pathol_130_147
Author(s) : Tian J , Diao H , Liang L , Hao C , Arthurs S , Ma R
Ref : J Invertebr Pathol , 130 :147 , 2015
Abstract : Isaria fumosorosea is an important pathogen of whiteflies, and is used as a mycoinsecticide against this pest in many regions of the world. We quantified the pathogenicity of the Chinese isolate IF-1106 against different life stages of sweetpotato whitefly, Bemisia tabaci, on cucumber plants, and describe the infection process and aspects of the host immunological response in the laboratory. The second instar was the most susceptible life stage to infection, with mortality rates at 10(7)conidia/ml approximately 83% after 7d. Scanning electron microscopy was used to monitor morphological aspects of the infection process. The following stages were observed; conidia adhered on the cuticle of B. tabaci and began to germinate within 6h of inoculation, appressoria development after 24h, germ tube penetration within 48h, emergent hyphae within 72h, secondary conidiogenesis within 96h with mass hyphal proliferation occurring on cadavers within 120h. The activities of endogenous enzymes were evaluated from host homogenate at various intervals post infection. Three enzymes associated with antioxidant activity [superoxide dismutase (SOD), perioxidase (POD), and catalase (CAT)], and two with detoxification [glutathione S-transferase (GSTs) and carboxylesterase (CarE)] were apparently upregulated in second instars infected by I. fumosorosea. Enzyme activities reached peak values at 48-60h post infection, then decreased to significantly lower than controls in 84h as mycosis occurred. Our results provide new insights into the pathogenicity and potential physiological response of B. tabaci to this fungal isolate.
ESTHER : Tian_2015_J.Invertebr.Pathol_130_147
PubMedSearch : Tian_2015_J.Invertebr.Pathol_130_147
PubMedID: 26264671

Title : Dietary lipid levels impact lipoprotein lipase, hormone-sensitive lipase, and fatty acid synthetase gene expression in three tissues of adult GIFT strain of Nile tilapia, Oreochromis niloticus - Tian_2015_Fish.Physiol.Biochem_41_1
Author(s) : Tian J , Wu F , Yang CG , Jiang M , Liu W , Wen H
Ref : Fish Physiol Biochem , 41 :1 , 2015
Abstract : The objective of this study was to assess the effects of dietary lipids on growth performance, body composition, serum parameters, and expression of genes involved in lipid metabolism in adult genetically improved farmed tilapia (GIFT strain) of Nile tilapia, Oreochromis niloticus. We randomly assigned adult male Nile tilapia (average initial body weight = 220.00 +/- 9.54 g) into six groups consisting of four replicates (20 fish per replicate). Fish in each group were hand-fed a semi-purified diets containing different lipid levels [3.3 (the control group), 28.4, 51.4, 75.4, 101.9, and 124.1 g kg(-1)] for 8 weeks. The results indicated that there was no obvious effect in feeding rate among all groups (P > 0.05). The highest weight gain, specific growth rate, and protein efficiency ratio in 75.4 g kg(-1) diet group were increased by 23.31, 16.17, and 22.02 % than that of fish in the control group (P < 0.05). Protein retention ratio was highest in 51.4 g kg(-1) diet group. The results revealed that the optimum dietary lipid level for maximum growth performance is 76.6-87.9 g kg(-1). Increasing dietary lipid levels contributed to increased tissue and whole body lipid levels. Saturated and monounsaturated fatty acids (MUFAs) decreased, and polyunsaturated fatty acids increased with increasing dietary lipid levels. With the exception of MUFAs, the fatty acid profiles of liver and muscle were similar. Dietary lipid levels were negatively correlated with low-density lipoprotein- cholesterol content and positively with triacylglycerol and glucose contents. In the lipid-fed groups, there was a significant down-regulation of fatty acid synthase (FAS) mRNA in liver, muscle, and visceral adipose tissues. There was a rapid up-regulation of lipoprotein lipase (LPL) mRNA in muscle and liver with increasing dietary lipid levels. In visceral adipose tissue, LPL mRNA was significantly down-regulated in the lipid-fed groups. Dietary lipids increased hormone-sensitive lipase (HSL) mRNA expression levels in the three tissues. These results strongly suggested that moderate dietary lipid levels were beneficial for adult tilapia growth performance and feed efficiency. However, excessive dietary lipid levels contributed to lipid deposition. Additionally, excessive dietary lipids may induce a competition between lipolysis and lipogenesis. FAS did not have tissue-specific regulation; however, the regulation of dietary lipids on LPL expression is tissue specific. FAS was a negative feedback regulator on fat deposition, and HSL was an indicator of fat content in tilapia.
ESTHER : Tian_2015_Fish.Physiol.Biochem_41_1
PubMedSearch : Tian_2015_Fish.Physiol.Biochem_41_1
PubMedID: 25347968

Title : Separation and purification of bioactive botrallin and TMC-264 by a combination of HSCCC and semi-preparative HPLC from endophytic fungus Hyalodendriella sp. Ponipodef12 - Mao_2014_World.J.Microbiol.Biotechnol_30_2533
Author(s) : Mao Z , Luo R , Luo H , Tian J , Liu H , Yue Y , Wang M , Peng Y , Zhou L
Ref : World J Microbiol Biotechnol , 30 :2533 , 2014
Abstract : Two dibenzo-alpha-pyrones, botrallin (1) and TMC-264 (2) were preparatively separated from crude ethyl acetate extract of the endophytic fungus Hyalodendriella sp. Ponipodef12, which was isolated from the hybrid 'Neva' of Populus deltoides Marsh x P. nigra L. using a combination of high-speed counter-current chromatography (HSCCC) and semi-preparative HPLC. Botrallin (1) with 74.73 % of purity and TMC-264 (2) with 82.29 % of purity were obtained through HSCCC by employing a solvent system containing n-hexane-ethyl acetate-methanol-water at a volume ratio of 1.2:1.0:0.9:1.0. It was the first time for TMC-264 (2) to be isolated from this fungus. TMC-264 (2) showed strong antimicrobial and antinematodal activity, and botrallin (1) exhibited moderate inhibitory activity on acetylcholinesterase.
ESTHER : Mao_2014_World.J.Microbiol.Biotechnol_30_2533
PubMedSearch : Mao_2014_World.J.Microbiol.Biotechnol_30_2533
PubMedID: 24898177

Title : Complete Genome Sequence of Magnetospirillum gryphiswaldense MSR-1 - Wang_2014_Genome.Announc_2_e00171
Author(s) : Wang X , Wang Q , Zhang W , Wang Y , Li L , Wen T , Zhang T , Zhang Y , Xu J , Hu J , Li S , Liu L , Liu J , Jiang W , Tian J , Li Y , Schuler D , Wang L , Li J
Ref : Genome Announc , 2 : , 2014
Abstract : We report the complete genomic sequence of Magnetospirillum gryphiswaldense MSR-1 (DSM 6361), a type strain of the genus Magnetospirillum belonging to the Alphaproteobacteria. Compared to the reported draft sequence, extensive rearrangements and differences were found, indicating high genomic flexibility and "domestication" by accelerated evolution of the strain upon repeated passaging.
ESTHER : Wang_2014_Genome.Announc_2_e00171
PubMedSearch : Wang_2014_Genome.Announc_2_e00171
PubMedID: 24625872
Gene_locus related to this paper: maggm-v6ezc0

Title : Comparative genomic analysis provides insights into the evolution and niche adaptation of marine Magnetospira sp. QH-2 strain - Ji_2014_Environ.Microbiol_16_525
Author(s) : Ji B , Zhang SD , Arnoux P , Rouy Z , Alberto F , Philippe N , Murat D , Zhang WJ , Rioux JB , Ginet N , Sabaty M , Mangenot S , Pradel N , Tian J , Yang J , Zhang L , Zhang W , Pan H , Henrissat B , Coutinho PM , Li Y , Xiao T , Medigue C , Barbe V , Pignol D , Talla E , Wu LF
Ref : Environ Microbiol , 16 :525 , 2014
Abstract : Magnetotactic bacteria (MTB) are capable of synthesizing intracellular organelles, the magnetosomes, that are membrane-bounded magnetite or greigite crystals arranged in chains. Although MTB are widely spread in various ecosystems, few axenic cultures are available, and only freshwater Magnetospirillum spp. have been genetically analysed. Here, we present the complete genome sequence of a marine magnetotactic spirillum, Magnetospira sp. QH-2. The high number of repeats and transposable elements account for the differences in QH-2 genome structure compared with other relatives. Gene cluster synteny and gene correlation analyses indicate that the insertion of the magnetosome island in the QH-2 genome occurred after divergence between freshwater and marine magnetospirilla. The presence of a sodium-quinone reductase, sodium transporters and other functional genes are evidence of the adaptive evolution of Magnetospira sp. QH-2 to the marine ecosystem. Genes well conserved among freshwater magnetospirilla for nitrogen fixation and assimilatory nitrate respiration are absent from the QH-2 genome. Unlike freshwater Magnetospirillum spp., marine Magnetospira sp. QH-2 neither has TonB and TonB-dependent receptors nor does it grow on trace amounts of iron. Taken together, our results show a distinct, adaptive evolution of Magnetospira sp. QH-2 to marine sediments in comparison with its closely related freshwater counterparts.
ESTHER : Ji_2014_Environ.Microbiol_16_525
PubMedSearch : Ji_2014_Environ.Microbiol_16_525
PubMedID: 23841906
Gene_locus related to this paper: 9prot-w6k5m7 , 9prot-w6khf2 , 9prot-w6kbu9

Title : Preparation and in vitro and in vivo evaluation of HupA PLGA Microsphere - Ye_2013_Pak.J.Pharm.Sci_26_315
Author(s) : Ye L , Fu F , Liu W , Sun K , Li Y , He J , Yu X , Yu P , Tian J
Ref : Pak J Pharm Sci , 26 :315 , 2013
Abstract : Acetylcholinesterase inhibitors (AChEIs), including Huperzine A (HupA), have been the mainstay of treatment for Alzheimer's disease (AD). However, AChEIs can cause gastrointestinal side effects, which has been related to the high C and short tmax after oral administration. Clinical trials have verified that extended-release formulation with lower C and prolonged tmax, such as rivastigmine patch, could perform a similar efficacy with significantly improved tolerability compared with the oral formulations. In this study, we developed an extended-release microspheres formulation of HupA (called as HAM) with poly(lactide-co-glycolide) (PLGA) as drug carrier. HAM has showed the loading rate as 1.35% (w/w) and yielded 42% with mean particle size at 72.6 mum. In vitro and in vivo pharmacokinetics studies have showed that HAM produced a relatively smooth and continuous drug concentration in 14 days. Furthermore, in vivo pharmacokinetics data have demonstrated that the C was lower and the tmax was considerably later in single intramuscular administration of HAM (1,000 mug/kg) than the counterparts in single intragastric administration of HAT (75 mug/kg/d). Meanwhile, HAM has performed a continuous inhibition to brain AChE activity in normal rats and improvement of memory deficit in Abeta i.c.v. infused AD rat model for 14 days. The results have suggested that HAM has performed good extended-release properties and good prolonged pharmacological efficacy in vivo in the 2-week period, and could exert a similar efficacy with significantly lowered gastrointestinal side effects as compared with oral formulation.
ESTHER : Ye_2013_Pak.J.Pharm.Sci_26_315
PubMedSearch : Ye_2013_Pak.J.Pharm.Sci_26_315
PubMedID: 23455202

Title : Probing the molecular determinant of the lipase-specific foldase Lif26 for the interaction with its cognate Lip26 - Zheng_2012_Int.J.Biol.Macromol_53C_54
Author(s) : Zheng X , Tian J , Wu N , Fan Y
Ref : Int J Biol Macromol , 53C :54 , 2012
Abstract : As a steric chaperone, the lipase-specific foldase Lif26 from Acinetobacter sp. XMZ-26 is required for correct folding of the lipase Lip26 in in vivo co-expression and in vitro refolding systems. Lif26 interacts with Lip26 as determined by yeast two hybrid assays in vivo and GST pull-down experiments in vitro. To study the molecular determinants of the interaction between Lif26 and Lip26, a homology model-based screening of residues, molecular dynamics (MD) simulation-based calculation of interaction energies, and site-directed mutagenesis to alter individual screened residues were applied. One conserved amino acid in the C-terminal mini-domain of Lif26, Arg332, was involved in the interaction with Lip26. Arg332 could not be replaced by any other residue, based on saturated site-directed mutagenesis, and it formed a conserved and stable salt bridge with Glu112 of Lip26, which may contribute to binding specificity. The residues surrounding Arg332, such as Trp288 in alpha9, likely stabilized Arg332 in the proper conformation for the interaction with Lip26.
ESTHER : Zheng_2012_Int.J.Biol.Macromol_53C_54
PubMedSearch : Zheng_2012_Int.J.Biol.Macromol_53C_54
PubMedID: 23153763
Gene_locus related to this paper: 9gamm-d7nn81

Title : Genome sequence of the milbemycin-producing bacterium Streptomyces bingchenggensis - Wang_2010_J.Bacteriol_192_4526
Author(s) : Wang XJ , Yan YJ , Zhang B , An J , Wang JJ , Tian J , Jiang L , Chen YH , Huang SX , Yin M , Zhang J , Gao AL , Liu CX , Zhu ZX , Xiang WS
Ref : Journal of Bacteriology , 192 :4526 , 2010
Abstract : Streptomyces bingchenggensis is a soil-dwelling bacterium producing the commercially important anthelmintic macrolide milbemycins. Besides milbemycins, the insecticidal polyether antibiotic nanchangmycin and some other antibiotics have also been isolated from this strain. Here we report the complete genome sequence of S. bingchenggensis. The availability of the genome sequence of S. bingchenggensis should enable us to understand the biosynthesis of these structurally intricate antibiotics better and facilitate rational improvement of this strain to increase their titers.
ESTHER : Wang_2010_J.Bacteriol_192_4526
PubMedSearch : Wang_2010_J.Bacteriol_192_4526
PubMedID: 20581206
Gene_locus related to this paper: strbb-d7bqj5 , strbb-d7br78 , strbb-d7bt68 , strbb-d7bu74 , strbb-d7bwt1 , strbb-d7bzy9 , strbb-d7c1k2 , strbb-d7c2f2 , strbb-d7c3x7 , strbb-d7c6p4 , strbb-d7c968 , strbb-d7c973 , strbb-d7cbn6 , strbb-d7cds1 , strbb-d7cet7 , strbb-d7cf67 , strbb-d7cgw9 , strbb-d7bqa3 , strbb-d7bw96 , strbb-d7bxw8

Title : The sequence and de novo assembly of the giant panda genome - Li_2010_Nature_463_311
Author(s) : Li R , Fan W , Tian G , Zhu H , He L , Cai J , Huang Q , Cai Q , Li B , Bai Y , Zhang Z , Zhang Y , Wang W , Li J , Wei F , Li H , Jian M , Nielsen R , Li D , Gu W , Yang Z , Xuan Z , Ryder OA , Leung FC , Zhou Y , Cao J , Sun X , Fu Y , Fang X , Guo X , Wang B , Hou R , Shen F , Mu B , Ni P , Lin R , Qian W , Wang G , Yu C , Nie W , Wang J , Wu Z , Liang H , Min J , Wu Q , Cheng S , Ruan J , Wang M , Shi Z , Wen M , Liu B , Ren X , Zheng H , Dong D , Cook K , Shan G , Zhang H , Kosiol C , Xie X , Lu Z , Li Y , Steiner CC , Lam TT , Lin S , Zhang Q , Li G , Tian J , Gong T , Liu H , Zhang D , Fang L , Ye C , Zhang J , Hu W , Xu A , Ren Y , Zhang G , Bruford MW , Li Q , Ma L , Guo Y , An N , Hu Y , Zheng Y , Shi Y , Li Z , Liu Q , Chen Y , Zhao J , Qu N , Zhao S , Tian F , Wang X , Wang H , Xu L , Liu X , Vinar T , Wang Y , Lam TW , Yiu SM , Liu S , Huang Y , Yang G , Jiang Z , Qin N , Li L , Bolund L , Kristiansen K , Wong GK , Olson M , Zhang X , Li S , Yang H
Ref : Nature , 463 :311 , 2010
Abstract : Using next-generation sequencing technology alone, we have successfully generated and assembled a draft sequence of the giant panda genome. The assembled contigs (2.25 gigabases (Gb)) cover approximately 94% of the whole genome, and the remaining gaps (0.05 Gb) seem to contain carnivore-specific repeats and tandem repeats. Comparisons with the dog and human showed that the panda genome has a lower divergence rate. The assessment of panda genes potentially underlying some of its unique traits indicated that its bamboo diet might be more dependent on its gut microbiome than its own genetic composition. We also identified more than 2.7 million heterozygous single nucleotide polymorphisms in the diploid genome. Our data and analyses provide a foundation for promoting mammalian genetic research, and demonstrate the feasibility for using next-generation sequencing technologies for accurate, cost-effective and rapid de novo assembly of large eukaryotic genomes.
ESTHER : Li_2010_Nature_463_311
PubMedSearch : Li_2010_Nature_463_311
PubMedID: 20010809
Gene_locus related to this paper: ailme-ABH15 , ailme-ACHE , ailme-BCHE , ailme-d2gtv3 , ailme-d2gty9 , ailme-d2gu87 , ailme-d2gu97 , ailme-d2gve7 , ailme-d2gwu1 , ailme-d2gx08 , ailme-d2gyt0 , ailme-d2gz36 , ailme-d2gz37 , ailme-d2gz38 , ailme-d2gz39 , ailme-d2gz40 , ailme-d2h5r9 , ailme-d2h7b7 , ailme-d2h9c9 , ailme-d2h794 , ailme-d2hau7 , ailme-d2hau8 , ailme-d2hcd9 , ailme-d2hdi6 , ailme-d2heu6 , ailme-d2hga4 , ailme-d2hqw5 , ailme-d2hs98 , ailme-d2hsx4 , ailme-d2hti6 , ailme-d2htv3 , ailme-d2htz6 , ailme-d2huc7 , ailme-d2hwj8 , ailme-d2hwy7 , ailme-d2hxm1 , ailme-d2hyc8 , ailme-d2hyv2 , ailme-d2hz11 , ailme-d2hza3 , ailme-d2hzr4 , ailme-d2i1l4 , ailme-d2i2g8 , ailme-g1l7m3 , ailme-g1lu36 , ailme-g1m769 , ailme-g1mc29 , ailme-g1mdj8 , ailme-g1mdr5 , ailme-g1mfp4 , ailme-g1mfx5 , ailme-g1lj41 , ailme-g1lm28 , ailme-g1l3u1 , ailme-g1l7l1 , ailme-g1m5i3 , ailme-g1l2f6 , ailme-g1lji5 , ailme-g1lqk3 , ailme-g1l8s9 , ailme-d2h717 , ailme-d2h718 , ailme-d2h719 , ailme-d2h720 , ailme-g1m5v0 , ailme-g1m5y7 , ailme-g1lkt7 , ailme-g1l2a1 , ailme-g1lsc8 , ailme-g1lrp4 , ailme-d2gv02 , ailme-g1mik5 , ailme-g1ljr1 , ailme-g1lxw7 , ailme-d2h8b5 , ailme-d2h2r2 , ailme-d2h9w7 , ailme-g1meh3 , ailme-g1m719

Title : A mutation upstream of an ATPase gene significantly increases magnetosome production in Magnetospirillum gryphiswaldense - Liu_2008_Appl.Microbiol.Biotechnol_81_551
Author(s) : Liu J , Ding Y , Jiang W , Tian J , Li Y , Li J
Ref : Applied Microbiology & Biotechnology , 81 :551 , 2008
Abstract : A mutant of Magnetospirillum gryphiswaldense, NPHB, was obtained from a conjugation experiment. An aberrant recombination occurred between a putative elongation factor-G gene (fus-like) of the bacterial chromosome and the chloramphenicol resistant gene (cat) of a suicide vector, pSUP202. Complementary experiments and transcription analysis of genes around the recombinant site showed that the cat promoter enhanced the expression of adenosine triphosphatase gene downstream. Adenosine triphosphate hydrolyzing activity in NPHB was 35% higher than in the wild-type strain (M. gryphiswaldense MSR-1). NPHB accumulated 71% less poly-beta-hydroxybutyrate and consumed 56% more oxygen and 40% more lactate than MSR-1. The magnetosome content of NPHB was 69% higher than MSR-1 in flask culture. NPHB cultured in a 7.5-L bioreactor gave a maximum yield of 58.4 +/- 6.4 mg magnetosomes per liter.
ESTHER : Liu_2008_Appl.Microbiol.Biotechnol_81_551
PubMedSearch : Liu_2008_Appl.Microbiol.Biotechnol_81_551
PubMedID: 18800186

Title : Fluorogenic substrates for high-throughput measurements of endothelial lipase activity - Mitnaul_2007_J.Lipid.Res_48_472
Author(s) : Mitnaul LJ , Tian J , Burton C , Lam MH , Zhu Y , Olson SH , Schneeweis JE , Zuck P , Pandit S , Anderson M , Maletic MM , Waddell ST , Wright SD , Sparrow CP , Lund EG
Ref : J Lipid Res , 48 :472 , 2007
Abstract : Endothelial lipase (EL) has been shown to be a critical determinant for high density lipoprotein cholesterol levels in vivo; therefore, assays that measure EL activity have become important for the discovery of small molecule inhibitors that specifically target EL. Here, we describe fluorescent Bodipy-labeled substrates that can be used in homogeneous, ultra-high-throughput kinetic assays that measure EL phospholipase or triglyceride lipase activities. Triton X-100 detergent micelles and synthetic HDL particles containing Bodipy-labeled phospholipid or Bodipy-labeled triglyceride substrates were shown to be catalytic substrates for EL, LPL, and HL. More importantly, only synthetic HDL particles containing Bodipy-labeled triglyceride were ideal substrates for EL, LPL, and HL in the presence of high concentrations of human or mouse serum. These data suggest that substrate presentation is a critical factor when determining EL activity in the presence of serum.
ESTHER : Mitnaul_2007_J.Lipid.Res_48_472
PubMedSearch : Mitnaul_2007_J.Lipid.Res_48_472
PubMedID: 17090660
Gene_locus related to this paper: human-LIPG

Title : Ralstonia eutropha H16 encodes two and possibly three intracellular Poly[D-(-)-3-hydroxybutyrate] depolymerase genes - York_2003_J.Bacteriol_185_3788
Author(s) : York GM , Lupberger J , Tian J , Lawrence AG , Stubbe J , Sinskey AJ
Ref : Journal of Bacteriology , 185 :3788 , 2003
Abstract : Intracellular poly[D-(-)-3-hydroxybutyrate] (PHB) depolymerases degrade PHB granules to oligomers and monomers of 3-hydroxybutyric acid. Recently an intracellular PHB depolymerase gene (phaZ1) from Ralstonia eutropha was identified. We now report identification of candidate PHB depolymerase genes from R. eutropha, namely, phaZ2 and phaZ3, and their characterization in vivo. phaZ1 was used to identify two candidate depolymerase genes in the genome of Ralstonia metallidurans. phaZ1 and these genes were then used to design degenerate primers. These primers and PCR methods on the R. eutropha genome were used to identify two new candidate depolymerase genes in R. eutropha: phaZ2 and phaZ3. Inverse PCR methods were used to obtain the complete sequence of phaZ3, and library screening was used to obtain the complete sequence of phaZ2. PhaZ1, PhaZ2, and PhaZ3 share approximately 30% sequence identity. The function of PhaZ2 and PhaZ3 was examined by generating R. eutropha H16 deletion strains (Delta phaZ1, Delta phaZ2, Delta phaZ3, Delta phaZ1 Delta phaZ2, Delta phaZ1 Delta phaZ3, Delta phaZ2 Delta phaZ3, and Delta phaZ1 Delta phaZ2 Delta phaZ3). These strains were analyzed for PHB production and utilization under two sets of conditions. When cells were grown in rich medium, PhaZ1 was sufficient to account for intracellular PHB degradation. When cells that had accumulated approximately 80% (cell dry weight) PHB were subjected to PHB utilization conditions, PhaZ1 and PhaZ2 were sufficient to account for PHB degradation. PhaZ2 is thus suggested to be an intracellular depolymerase. The role of PhaZ3 remains to be established.
ESTHER : York_2003_J.Bacteriol_185_3788
PubMedSearch : York_2003_J.Bacteriol_185_3788
PubMedID: 12813072
Gene_locus related to this paper: cupne-q7wt48 , cupne-q7wt49

Title : Polyhydroxyalkanoate (PHA) hemeostasis: the role of PHA synthase - Stubbe_2003_Nat.Prod.Rep_20_445
Author(s) : Stubbe J , Tian J
Ref : Nat Prod Rep , 20 :445 , 2003
Abstract : Polyhydroxyalkanoates (PHAs) are biodegradable polymers with properties of thermoplastics Production of these polymers in an economically competitive fashion via bioengineering requires an understanding of the biosynthetic pathway and its regulation. This review summarizes our current knowledge of the mechanism of the class I and III PHA synthases: the initiation, elongation and termination processes. It also summarizes our current understanding of the phase transition from soluble substrates (coenzyme A esters of beta-hydroxyalkanoates) to insoluble granules and our understanding of the requirement for a transcription factor, phasin proteins, and depolymerases in PHA homeostasis.
ESTHER : Stubbe_2003_Nat.Prod.Rep_20_445
PubMedSearch : Stubbe_2003_Nat.Prod.Rep_20_445
PubMedID: 14620841

Title : Open-loop and closed-loop optokinetic nystagmus (OKN) in myasthenia gravis and nonmyasthenic subjects - Yang_2000_Exp.Neurol_166_166
Author(s) : Yang Q , Wei M , Sun F , Tian J , Chen X , Lu C
Ref : Experimental Neurology , 166 :166 , 2000
Abstract : Optokinetic nystagmus (OKN) eye movements of myasthenia gravis (MG) and nonmyasthenic ocular palsies, and normal subjects were examined under closed-loop and open-loop conditions. The open-loop OKN condition was achieved by adding the signal of eye-movement velocity of OKN to the computer-generated signal controlling the stimulus grating moving. The OKN was recorded by means of electromagnetic search scleral coil technique. In MG patients, the open-loop gains of OKN increased significantly after the intramuscular injection of an acetylcholinesterase inhibitor, neostigmine, while the closed-loop OKN gains were not significantly changed. Both the closed-loop and open-loop OKN gains of normal subjects and nonmyasthenic patients were not increased for the administration of neostigmine. The experimental results indicated that the open-loop OKN gain could be sensitive to reflect the changes of the function of neuromuscular junction in MG patients.
ESTHER : Yang_2000_Exp.Neurol_166_166
PubMedSearch : Yang_2000_Exp.Neurol_166_166
PubMedID: 11031092