Wen H

References (20)

Title : Enhancement degradation efficiency of pyrethroid-degrading esterase (Est816) through rational design and its application in bioremediation - Fan_2023_Chemosphere_319_138021
Author(s) : Fan X , Zhao M , Wen H , Zhang Y , Zhang J , Liu X
Ref : Chemosphere , 319 :138021 , 2023
Abstract : The pervasive use of pyrethroids is seriously hazardous to the environment and even human health. Enzymatic bioremediation is potentially a rapid and environmentally friendly technology to combat the pollution of pyrethroid pesticides. The hydrolysis of ester linkages is the initial and critical enzymatic step in microbial degradation pathways. Here, the versatile and thermostable esterase Est816 was cloned and its new function, pyrethroid-hydrolysis activity, was expanded. To further improve its pyrethroid-hydrolysis ability, Est816 was modified by rational design. After two rounds of mutation, the best-performing mutant, Est816(A216V/K238N/M97V,) was obtained, which could completely degrade 1 mg/L lambda-cyhalothrin, cypermethrin, and deltamethrin within 20 min, and efficiently degrade fenvalerate, reaching over 80% conversion. Degradation activity analyses showed that three substitutions (A216V, K238 N and M97V) were beneficial for enhancing the activity of Est816. Enzymatic characterization showed that Est816(A216V/K238N/M97V) inherited broad substrate specificity and possessed excellent stability and adaptability over wide ranges of temperature and pH, which is essential for bioremediation in frequently changing conditions. Furthermore, Est816(A216V/K238N/M97V) had the best degradation effect on all four pyrethroid residues in Panax notoginseng root, with more than 87% conversion after 24 h. Pyrethroid residues in tea, cucumber, and soil were reduced by more than 76%, 80%, and 76%, respectively. Taken together, these findings highlight the great potential of Est816(A216V/K238N/M97V) in the bioremediation of pyrethroid-contaminated soil and agricultural products.
ESTHER : Fan_2023_Chemosphere_319_138021
PubMedSearch : Fan_2023_Chemosphere_319_138021
PubMedID: 36731665
Gene_locus related to this paper: 9bact-i6yrg4

Title : Exploration of Synergistic Pesticidal Activities, Control Effects and Toxicology Study of a Monoterpene Essential Oil with Two Natural Alkaloids - Xu_2023_Toxins.(Basel)_15_
Author(s) : Xu J , Lv M , Fang S , Wang Y , Wen H , Zhang S , Xu H
Ref : Toxins (Basel) , 15 : , 2023
Abstract : With the increasing development of pest resistances, it is not easy to achieve satisfactory control effects by using only one agrochemical. Additionally, although the alkaloid matrine (MT) isolated from Sophora flavescens is now utilized as a botanical pesticide in China, in fact, its pesticidal activities are much lower in magnitude than those of commercially agrochemicals. To improve its pesticidal activities, here, the joint pesticidal effects of MT with another alkaloid oxymatrine (OMT) (isolated from S. flavescens) and the monoterpene essential oil 1,8-cineole (CN) (isolated from the eucalyptus leaves) were investigated in the laboratory and greenhouse conditions. Moreover, their toxicological properties were also studied. Against Plutella xylostella, when the mass ratio of MT and OMT was 8/2, good larvicidal activity was obtained; against Tetranychus urticae, when the mass ratio of MT and OMT was 3/7, good acaricidal activity was obtained. Especially when MT and OMT were combined with CN, the significant synergistic effects were observed: against P. xylostella, the co-toxicity coefficient (CTC) of MT/OMT (8/2)/CN was 213; against T. urticae, the CTC of MT/OMT (3/7)/CN was 252. Moreover, the activity changes over time of two detoxification enzymes, carboxylesterase (CarE) and glutathione S-transferase (GST) of P. xylostella treated with MT/OMT (8/2)/CN, were observed. In addition, by scanning electron microscope (SEM), the toxicological study suggested that the acaricidal activity of MT/OMT (3/7)/CN may be related to the damage of the cuticle layer crest of T. urticae.
ESTHER : Xu_2023_Toxins.(Basel)_15_
PubMedSearch : Xu_2023_Toxins.(Basel)_15_
PubMedID: 37104178

Title : Integrative Analysis of Transcriptome and Metabolome Reveals Molecular Responses in Eriocheir sinensis with Hepatopancreatic Necrosis Disease - Zhan_2022_Biology.(Basel)_11_
Author(s) : Zhan M , Wen L , Zhu M , Gong J , Xi C , Wen H , Xu G , Shen H
Ref : Biology (Basel) , 11 : , 2022
Abstract : Hepatopancreatic necrosis disease (HPND) is a highly lethal disease that first emerged in 2015 in Jiangsu Province, China. So far, most researchers believe that this disease is caused by abiotic factors. However, its true pathogenic mechanism remains unknown. In this study, the effects of HPND on the metabolism and other biological indicators of the Chinese mitten crab (Eriocheir sinensis) were evaluated by integrating transcriptomics and metabolomics. Our findings demonstrate that the innate immunity, antioxidant activity, detoxification ability, and nervous system of the diseased crabs were affected. Additionally, metabolic pathways such as lipid metabolism, nucleotide metabolism, and protein metabolism were dysregulated, and energy production was slightly increased. Moreover, the IL-17 signaling pathway was activated and high levels of autophagy and apoptosis occurred in diseased crabs, which may be related to hepatopancreas damage. The abnormal mitochondrial function and possible anaerobic metabolism observed in our study suggested that functional hypoxia may be involved in HPND progression. Furthermore, the activities of carboxylesterase and acetylcholinesterase were significantly inhibited, indicating that the diseased crabs were likely stressed by pesticides such as pyrethroids. Collectively, our findings provide new insights into the molecular mechanisms altered in diseased crabs, as well as the etiology and pathogenic mechanisms of HPND.
ESTHER : Zhan_2022_Biology.(Basel)_11_
PubMedSearch : Zhan_2022_Biology.(Basel)_11_
PubMedID: 36138745

Title : Silencing of MsD14 Resulted in Enhanced Forage Biomass through Increasing Shoot Branching in Alfalfa (Medicago sativa L.) - Ma_2022_Plants.(Basel)_11_
Author(s) : Ma L , Zhang Y , Wen H , Liu W , Zhou Y , Wang X
Ref : Plants (Basel) , 11 : , 2022
Abstract : Branching is one of the key determinants of plant architecture that dramatically affects crop yield. As alfalfa is the most important forage crop, understanding the genetic basis of branching in this plant can facilitate breeding for a high biomass yield. In this study, we characterized the strigolactone receptor gene MsD14 in alfalfa and demonstrated that MsD14 was predominantly expressed in flowers, roots, and seedpods. Furthermore, we found that MsD14 expression could significantly respond to strigolactone in alfalfa seedlings, and its protein was located in the nucleus, cytoplasm, and cytomembrane. Most importantly, transformation assays demonstrated that silencing of MsD14 in alfalfa resulted in increased shoot branching and forage biomass. Significantly, MsD14 could physically interact with AtMAX2 and MsMAX2 in the presence of strigolactone, suggesting a similarity between MsD14 and AtD14. Together, our results revealed the conserved D14-MAX2 module in alfalfa branching regulation and provided candidate genes for alfalfa high-yield molecular breeding.
ESTHER : Ma_2022_Plants.(Basel)_11_
PubMedSearch : Ma_2022_Plants.(Basel)_11_
PubMedID: 35406919

Title : A hemicyanine-based fluorescent probe for simultaneous imaging of Carboxylesterases and Histone deacetylases in hepatocellular carcinoma - Shu_2022_Spectrochim.Acta.A.Mol.Biomol.Spectrosc_281_121529
Author(s) : Shu Y , Huang C , Liu H , Hu F , Wen H , Liu J , Wang X , Shan C , Li W
Ref : Spectrochim Acta A Mol Biomol Spectrosc , 281 :121529 , 2022
Abstract : Carboxylesterases (CESs) and Histone deacetylases (HDACs) are regarded as important signaling enzymes highly associated with the development and progression of multiple cancers, including hepatocellular carcinoma (HCC). In this work, a near-infrared (NIR) fluorescent probe named Lys-HXPI was designed and synthesized, which linked a hemicyanine dye and 6-acetamidohexanoic acid via an ester bond. Lys-HXPI displayed a remarkable increase with a NIR emission at 720 nm, a low detection limit (<10 nM) for HDAC1, HDAC 6, CES1 and CES2, as well as a high selectivity for the target enzymes over other relevant analytes. Furthermore, Lys-HXPI was used to image endogenous target enzymes in living cells, tumor-bearing nude mice and tissue slices. The ability of Lys-HXPI to simultaneous image CESs and HDACs was demonstrated with RT-qPCR and the confocal imaging in Hep G2 and MDA-MB-231. Taking advantage of NIR emission, the probe was also successfully applied to imaging Hep G2 tumor mice and tissue slices. Lys-HXPI is expected to be useful for the effective detecting of CESs and HDACs in complex biosystems.
ESTHER : Shu_2022_Spectrochim.Acta.A.Mol.Biomol.Spectrosc_281_121529
PubMedSearch : Shu_2022_Spectrochim.Acta.A.Mol.Biomol.Spectrosc_281_121529
PubMedID: 35797949

Title : Does butyrylcholinesterase mediate exercise-induced and meal-induced suppression in acylated ghrelin? - Li_2022_Endocr.J__
Author(s) : Li G , Tataka Y , Kamemoto K , Wen H , Yamanaka K , Nagayama C , Miyashita M
Ref : Endocrine Journal , : , 2022
Abstract : Ample evidence supports the notion that an acute bout of aerobic exercise and meal consumption reduces acylated ghrelin concentration. However, the mechanisms by which this exercise- and meal-induced suppression of acylated ghrelin occurs in humans is unknown. This study aimed to examine the concentration of butyrylcholinesterase (BChE), an enzyme responsible for hydrolysing ghrelin and other appetite-related hormones in response to a single bout of running and a standardised meal in young, healthy men. Thirty-three men (aged 23 +/- 2 years, mean +/- standard deviation) underwent two (exercise and meal conditions) 2-h laboratory-based experiments. In the exercise condition, all participants ran for 30 min at 70% of the maximum oxygen uptake (0930-1000) and rested until 1130. In the meal condition, participants reported to the laboratory at 0930 and rested until 1000. Subsequently, they consumed a standardised meal (1000-1015) and rested until 1130. Blood samples were collected at baseline (0930), 1000, 1030, 1100 and 1130. BChE concentration was not altered in both the exercise and meal conditions (p > 0.05). However, acylated ghrelin was suppressed after exercise (p < 0.05) and meal consumption (p < 0.05). There was no association between the change in BChE concentration and the change in acylated ghrelin before and after exercise (p = 0.571). Although des-acylated ghrelin concentration did not change during exercise (p > 0.05), it decreased after meal consumption (p < 0.05). These findings suggest that BChE may not be involved in the suppression of acylated ghrelin after exercise and meal consumption.
ESTHER : Li_2022_Endocr.J__
PubMedSearch : Li_2022_Endocr.J__
PubMedID: 36047188

Title : Red-to-blue paper-based colorimetric sensor integrated with smartphone for point-of-use analysis of cerebral AChE upon Cd(2+) exposure - Liu_2021_Nanoscale__
Author(s) : Liu C , Luo Y , Wen H , Qi Y , Shi G , Deng J , Zhou T
Ref : Nanoscale , : , 2021
Abstract : Herein, combined with a pervasive smartphone installed with a color recognition app, dual-responsive CDs@Eu/GMP ICPs were designed as a red-to-blue paper-based colorimetric sensor for the point-of-use analysis of cerebral acetylcholinesterase (AChE) upon Cd2+ exposure. Blue-emitting CDs with multi-functional groups as guests were encapsulated into the network of Eu/GMP ICPs to obtain CDs@Eu/GMP ICPs with the sensitized red fluorescence of Eu3+. With the presence of thiocholine (TCh), derived from acetylthiocholine (ATCh) hydrolyzed by AChE, the coordination environment of the CDs@Eu/GMP ICPs was interrupted, leading to the collapse of the CDs@Eu/GMP ICP network and the corresponding release of guest CDs into the surrounding environment. Consequently, the sensitized red fluorescence of Eu3+ decreased and the blue fluorescence of the CDs increased. This obvious red-to-blue fluorescent color changes of CDs@Eu/GMP ICPs on test paper could then be integrated with the smartphone for point-of-use analysis of cerebral AChE upon Cd2+ exposure, which not only offers a new analytical platform for a better understanding of the environmental risk of Alzheimer's Dementia (AD), but also holds great potential in the early diagnosis of AD even at the asymptomatic stage with the decrease in CSF AChE as an early biomarker.
ESTHER : Liu_2021_Nanoscale__
PubMedSearch : Liu_2021_Nanoscale__
PubMedID: 33406172

Title : The Comparative Efficacy of Multiple Interventions for Mild Cognitive Impairment in Alzheimer's Disease: A Bayesian Network Meta-Analysis - Lai_2020_Front.Aging.Neurosci_12_121
Author(s) : Lai X , Wen H , Li Y , Lu L , Tang C
Ref : Front Aging Neurosci , 12 :121 , 2020
Abstract : Background: Mild cognitive impairment (MCI) is the early phase of Alzheimer's disease (AD). The aim of early intervention for MCI is to decrease the rate of conversion from MCI to AD. However, the efficacy of multiple interventions in MCI, and the optimal methods of delivery, remain controversial. We aimed to compare and rank the treatment methods for MCI in AD, in order to find an optimal intervention for MCI and a way to prevent or delay the occurrence of AD. Methods: Pair-wise and network meta-analysis were conducted to integrate the treatment effectiveness through direct and indirect evidence. Four English databases and three Chinese databases were searched for international registers of eligible published, single or double blind, randomized controlled trials up to September 31st 2019. We included nine comparative interventions: pharmacological therapies which incorporated cholinesterase inhibitors (ChEI), ginkgo, nimodipine, and Chinese medicine; non-pharmacological therapies comprising of acupuncture, music therapy, exercise therapy, and nutrition therapy; and a placebo group. The primary outcome was the Mini-Mental State Examination (MMSE) score. The secondary outcome was the AD Assessment Scale-cognitive subscale (ADAS-cog). Results: Twenty-eight trials were eligible, including 6,863 participants. In the direct meta-analysis, as for the Mini-Mental State Examination scale, the ChEIs (MD: -0.38; 95% CI: -0.74, -0.01), Chinese medicine (MD: -0.31; 95% CI: -0.75, 0.13), exercise therapy (MD: -0.50; 95% CI: -0.65, -0.35), music therapy (MD: -1.71; 95% CI: -4.49, 1.07), were statistically more efficient than placebo. For AD Assessment Scalecognitive subscale outcome, ChEIs (MD: 1.20; 95% CI: 0.73, 1.68), Acupuncture (MD: 1.36; 95% CI: 1.28, 1.44), Chinese medicine (MD: 0.61; 95% CI: 0.49, 0.73) and exercise (MD: 0.61; 95% CI: 0.49, 0.73) were better than placebo. In the network meta-analysis, the MMSE outcome ranked music therapy (59%) as the best and Acupuncture (26%) as second. Nutrition and Ginkgo treatment had the lowest rank among all interventions. For ADAS-cog outcome, acupuncture (52) ranked the best. Conclusion: Among the nine treatments studied, music therapy appears to be the best treatment for MCI, followed by acupuncture. Our study provides new insights into potential clinical treatments for MCI due to AD, and may aid the development of guidelines for MCI in AD.
ESTHER : Lai_2020_Front.Aging.Neurosci_12_121
PubMedSearch : Lai_2020_Front.Aging.Neurosci_12_121
PubMedID: 32581760

Title : Zebrafish neuromuscular junction: The power of N - Brehm_2019_Neurosci.Lett_713_134503
Author(s) : Brehm P , Wen H
Ref : Neuroscience Letters , 713 :134503 , 2019
Abstract : In the early 1950s, Katz and his colleagues capitalized on the newly developed intracellular microelectrode recording technique to investigate synaptic transmission. For study they chose frog neuromuscular junction (NMJ), which was ideally suited due to the accessibility and large size of the muscle cells. Paradoxically, the large size precluded the use of next generation patch clamp technology. Consequently, electrophysiological study of synaptic function shifted to small central synapses made amenable by patch clamp. Recently, however, the unique features offered by zebrafish have rekindled interest in the NMJ as a model for electrophysiological study of synaptic transmission. The small muscle size and synaptic simplicity provide the singular opportunity to perform in vivo spinal motoneuron-target muscle patch clamp recordings. Additional incentive is provided by zebrafish lines harboring mutations in key synaptic proteins, many of which are embryonic lethal in mammals, but all of which are able to survive well past synapse maturation in zebrafish. This mini-review will highlight features that set zebrafish NMJs apart from traditional NMJs. We also draw into focus findings that offer the promise of identifying features that define release sites, which serve to set the upper limit of transmitter release. Since its conception several candidates representing release sites have been proposed, most of which are based on distinctions among vesicle pools in their state of readiness for release. However, models based on distinctions among vesicles have become enormously complicated and none adequately account for setting an upper limit for exocytosis in response to an action potential (AP). Specifically, findings from zebrafish NMJ point to an alternative model, positing that elements other than vesicles per se set the upper limits of release.
ESTHER : Brehm_2019_Neurosci.Lett_713_134503
PubMedSearch : Brehm_2019_Neurosci.Lett_713_134503
PubMedID: 31557523

Title : A Probe for Fluorescence Detection of the Acetylcholinesterase Activity Based on Molecularly Imprinted Polymers Coated Carbon Dots - Jia_2019_Chem.Pharm.Bull.(Tokyo)_67_795
Author(s) : Jia Z , Luo Y , Wen H , Huang S , Du X , Xue W
Ref : Chem Pharm Bull (Tokyo) , 67 :795 , 2019
Abstract : This paper presents a new probe for fluorescence detection of the acetylcholinesterase (AChE) activity based on molecularly imprinted polymer (MIP) coated carbon dots (C-dots) composite. The C-dots were hydrothermally synthesized with grafted silica surface and sealed with molecularly imprinted polymers in silica pores (MIP@C-dots) in situ. Removed the original template molecules, the MIP@C-dots composite exhibits quite high selectivity for acetylthiocholine (ACh). With AChE, its substrate ACh will be hydrolyzed into thiocholine and the fluorescence signals exhibit a dramatic decrease at 465 nm, Under optimal conditions, the fluorescent probe shows sensitive responses to AChE in the range of 0.01-0.6 mU/mL. The detection limits of AChE are as low as 3 microU/mL. These experiments results validate the novel fluorescent probe based on MIP@C-dots composite, paving a new way to evaluation of AChE activity and Screening inhibitors.
ESTHER : Jia_2019_Chem.Pharm.Bull.(Tokyo)_67_795
PubMedSearch : Jia_2019_Chem.Pharm.Bull.(Tokyo)_67_795
PubMedID: 31061298

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 : Fatigue in Rapsyn-Deficient Zebrafish Reflects Defective Transmitter Release - Wen_2016_J.Neurosci_36_10870
Author(s) : Wen H , Hubbard JM , Wang WC , Brehm P
Ref : Journal of Neuroscience , 36 :10870 , 2016
Abstract : Rapsyn-deficient myasthenic syndrome is characterized by a weakness in voluntary muscle contraction, a direct consequence of greatly reduced synaptic responses that result from poorly clustered acetylcholine receptors. As with other myasthenic syndromes, the general muscle weakness is also accompanied by use-dependent fatigue. Here, we used paired motor neuron target muscle patch-clamp recordings from a rapsyn-deficient mutant line of zebrafish to explore for the first time the mechanisms causal to fatigue. We find that synaptic responses in mutant fish can follow faithfully low-frequency stimuli despite the reduced amplitude. This is in part helped by a compensatory increase in the number of presynaptic release sites in the mutant fish. In response to high-frequency stimulation, both wild-type and mutant neuromuscular junctions depress to steady-state response levels, but the latter shows exaggerated depression. Analysis of the steady-state transmission revealed that vesicle reloading and release at individual release sites is significantly slower in mutant fish during high-frequency activities. Therefore, reductions in postsynaptic receptor density and compromised presynaptic release collectively serve to reduce synaptic strength to levels that fall below the threshold for muscle action potential generation, thus accounting for use-dependent fatigue. Our findings raise the possibility that defects in motor neuron function may also be at play in other myasthenic syndromes that have been mapped to mutations in muscle-specific proteins. SIGNIFICANCE STATEMENT: Use-dependent fatigue accompanies many neuromuscular myasthenic syndromes, including muscle rapsyn deficiency. Here, using a rapsyn-deficient line of zebrafish, we performed paired motor neuron target muscle patch-clamp recordings to investigate the mechanisms causal to this phenomenon. Our findings indicate that the reduced postsynaptic receptor density resulting from defective rapsyn contributes to weakness, but is not solely responsible for use-dependent fatigue. Instead, we find unexpected involvement of altered transmitter release from the motor neuron. Specifically, slowed reloading of vesicle release sites leads to augmented synaptic depression during repeated action potentials. Even at moderate stimulus frequencies, the depression levels for evoked synaptic responses fall below the threshold for the generation of muscle action potentials. The associated contraction failures are manifest as use-dependent fatigue.
ESTHER : Wen_2016_J.Neurosci_36_10870
PubMedSearch : Wen_2016_J.Neurosci_36_10870
PubMedID: 27798141

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 : Crystal structure of tannase from lactobacillusplantarum - Ren_2013_J.Mol.Biol_425_2737
Author(s) : Ren B , Wu M , Wang Q , Peng X , Wen H , McKinstry WJ , Chen Q
Ref : Journal of Molecular Biology , 425 :2737 , 2013
Abstract : Tannins are water-soluble polyphenolic compounds in plants. Hydrolyzable tannins are derivatives of gallic acid (3,4,5-trihydroxybenzoic acid) or its meta-depsidic forms that are esterified to polyol, catechin, or triterpenoid units. Tannases are a family of esterases that catalyze the hydrolysis of the galloyl ester bond in hydrolyzable tannins to release gallic acid. The enzymes have found wide applications in food, feed, beverage, pharmaceutical, and chemical industries since their discovery more than a century ago, although little is known about them at the molecular level, including the details of the catalytic and substrate binding sites. Here, we report the first three-dimensional structure of a tannase from Lactobacillus plantarum. The enzyme displays an alpha/beta structure, featured by a large cap domain inserted into the classical serine hydrolase fold. A catalytic triad was identified in the structure, which is composed of Ser163, His451, and Asp419. During the binding of gallic acid, the carboxyl group of the molecule forges hydrogen-bonding interactions with the catalytic triad of the enzyme while the three hydroxyl groups make contacts with Asp421, Lys343, and Glu357 to form another hydrogen-bonding network. Mutagenesis studies demonstrated that these residues are indispensable for the activity of the enzyme. Structural studies of the enzyme in complex with a number of substrates indicated that the interactions at the galloyl binding site are the determinant force for the binding of substrates. The single galloyl binding site is responsible for the esterase and depsidase activities of the enzyme.
ESTHER : Ren_2013_J.Mol.Biol_425_2737
PubMedSearch : Ren_2013_J.Mol.Biol_425_2737
PubMedID: 23648840
Gene_locus related to this paper: lacpl-tanL

Title : Expression, purification, crystallization and preliminary X-ray analysis of tannase from Lactobacillus plantarum. - Wu_2013_Acta.Crystallogr.Sect.F.Struct.Biol.Cryst.Commun_69_456
Author(s) : Wu M , Peng X , Wen H , Wang Q , Chen Q , McKinstry WJ , Ren B
Ref : Acta Crystallographica Sect F Struct Biol Cryst Commun , 69 :456 , 2013
Abstract : Tannase catalyses the hydrolysis of the galloyl ester bond of tannins to release gallic acid. It belongs to the serine esterases and has wide applications in the food, feed, beverage, pharmaceutical and chemical industries. The tannase from Lactobacillus plantarum was cloned, expressed and purified. The protein was crystallized by the sitting-drop vapour-diffusion method with microseeding. The crystals belonged to space group P1, with unit-cell paramters a = 46.5, b = 62.8, c = 83.8 A, alpha = 70.4, beta = 86.0, gamma = 79.4degre. Although the enzyme exists mainly as a monomer in solution, it forms a dimer in the asymmetric unit of the crystal. The crystals diffracted to beyond 1.60A resolution using synchrotron radiation and a complete data set was collected to 1.65A resolution.
ESTHER : Wu_2013_Acta.Crystallogr.Sect.F.Struct.Biol.Cryst.Commun_69_456
PubMedSearch : Wu_2013_Acta.Crystallogr.Sect.F.Struct.Biol.Cryst.Commun_69_456
PubMedID: 23545659
Gene_locus related to this paper: lacpl-tanL

Title : The genome of the hydatid tapeworm Echinococcus granulosus - Zheng_2013_Nat.Genet_45_1168
Author(s) : Zheng H , Zhang W , Zhang L , Zhang Z , Li J , Lu G , Zhu Y , Wang Y , Huang Y , Liu J , Kang H , Chen J , Wang L , Chen A , Yu S , Gao Z , Jin L , Gu W , Wang Z , Zhao L , Shi B , Wen H , Lin R , Jones MK , Brejova B , Vinar T , Zhao G , McManus DP , Chen Z , Zhou Y , Wang S
Ref : Nat Genet , 45 :1168 , 2013
Abstract : Cystic echinococcosis (hydatid disease), caused by the tapeworm E. granulosus, is responsible for considerable human morbidity and mortality. This cosmopolitan disease is difficult to diagnose, treat and control. We present a draft genomic sequence for the worm comprising 151.6 Mb encoding 11,325 genes. Comparisons with the genome sequences from other taxa show that E. granulosus has acquired a spectrum of genes, including the EgAgB family, whose products are secreted by the parasite to interact and redirect host immune responses. We also find that genes in bile salt pathways may control the bidirectional development of E. granulosus, and sequence differences in the calcium channel subunit EgCavbeta1 may be associated with praziquantel sensitivity. Our study offers insights into host interaction, nutrient acquisition, strobilization, reproduction, immune evasion and maturation in the parasite and provides a platform to facilitate the development of new, effective treatments and interventions for echinococcosis control.
ESTHER : Zheng_2013_Nat.Genet_45_1168
PubMedSearch : Zheng_2013_Nat.Genet_45_1168
PubMedID: 24013640
Gene_locus related to this paper: echgr-k4epc5 , echmu-u6hbw4 , echgr-w6ugl0 , echgr-w6u7y4 , echgr-w6vaq5 , echgr-a0a068wxj3 , echgr-a0a068wgw1 , echgr-a0a068wl60

Title : High-resolution structures of AidH complexes provide insights into a novel catalytic mechanism for N-acyl homoserine lactonase - Gao_2013_Acta.Crystallogr.D.Biol.Crystallogr_69_82
Author(s) : Gao A , Mei GY , Liu S , Wang P , Tang Q , Liu YP , Wen H , An XM , Zhang LQ , Yan XX , Liang DC
Ref : Acta Crystallographica D Biol Crystallogr , 69 :82 , 2013
Abstract : Many pathogenic bacteria that infect humans, animals and plants rely on a quorum-sensing (QS) system to produce virulence factors. N-Acyl homoserine lactones (AHLs) are the best-characterized cell-cell communication signals in QS. The concentration of AHL plays a key role in regulating the virulence-gene expression and essential biological functions of pathogenic bacteria. N-Acyl homoserine lactonases (AHL-lactonases) have important functions in decreasing pathogenicity by degrading AHLs. Here, structures of the AHL-lactonase from Ochrobactrum sp. (AidH) in complex with N-hexanoyl homoserine lactone, N-hexanoyl homoserine and N-butanoyl homoserine are reported. The high-resolution structures together with biochemical analyses reveal convincing details of AHL degradation. No metal ion is bound in the active site, which is different from other AHL-lactonases, which have a dual Lewis acid catalysis mechanism. AidH contains a substrate-binding tunnel between the core domain and the cap domain. The conformation of the tunnel entrance varies with the AHL acyl-chain length, which contributes to the binding promiscuity of AHL molecules in the active site. It also supports the biochemical result that AidH is a broad catalytic spectrum AHL-lactonase. Taken together, the present results reveal the catalytic mechanism of the metal-independent AHL-lactonase, which is a typical acid-base covalent catalysis.
ESTHER : Gao_2013_Acta.Crystallogr.D.Biol.Crystallogr_69_82
PubMedSearch : Gao_2013_Acta.Crystallogr.D.Biol.Crystallogr_69_82
PubMedID: 23275166
Gene_locus related to this paper: 9rhiz-d2j2t6

Title : Methyl 2-(2-(4-formylphenoxy)acetamido)-2-substituted acetate derivatives: a new class of acetylcholinesterase inhibitors - Wen_2007_Bioorg.Med.Chem.Lett_17_2123
Author(s) : Wen H , Zhou Y , Lin C , Ge H , Ma L , Wang Z , Peng W , Song H
Ref : Bioorganic & Medicinal Chemistry Lett , 17 :2123 , 2007
Abstract : A new class of inhibitors of acetylcholinesterase (methyl 2-(2-(4-formylphenoxy)acetamido)-2-substituted acetate derivatives) is described. Compounds 4b and 4i were found to be more potent than galanthamine in inhibiting acetylcholinesterase.
ESTHER : Wen_2007_Bioorg.Med.Chem.Lett_17_2123
PubMedSearch : Wen_2007_Bioorg.Med.Chem.Lett_17_2123
PubMedID: 17317172

Title : Paired motor neuron-muscle recordings in zebrafish test the receptor blockade model for shaping synaptic current - Wen_2005_J.Neurosci_25_8104
Author(s) : Wen H , Brehm P
Ref : Journal of Neuroscience , 25 :8104 , 2005
Abstract : The transparent spinal cord and electrically compact fast muscle of zebrafish offer the first opportunity to perform simultaneous whole-cell patch-clamp recordings from both motor neuron and target skeletal muscle in situ. Our paired recordings reveal the fastest reported kinetics for both spontaneous and evoked synaptic currents at any synapse and a large quantal size that facilitates the resolution of spontaneous synaptic currents. We used this preparation to test the recent proposal that open channel block of the acetylcholine receptor by acetylcholine modulates the kinetics and timing of transmission between nerve and muscle in larval zebrafish (Legendre et al., 2000). Contrary to the predictions of this model, we find similar delay and onset kinetics of synaptic current at positive and negative muscle membrane potentials, even after inhibition of acetylcholinesterase. In contrast, blockade of motor neuron K channels by 4-aminopyridine prolonged the action potential and introduced a significant delay and slowing of evoked synaptic currents, demonstrating our ability to measured altered transmitter release with this system. We conclude that the kinetics of neuromuscular synaptic currents in zebrafish is not governed by receptor block.
ESTHER : Wen_2005_J.Neurosci_25_8104
PubMedSearch : Wen_2005_J.Neurosci_25_8104
PubMedID: 16135768

Title : Tethering naturally occurring peptide toxins for cell-autonomous modulation of ion channels and receptors in vivo - Ibanez-Tallon_2004_Neuron_43_305
Author(s) : Ibanez-Tallon I , Wen H , Miwa JM , Xing J , Tekinay AB , Ono F , Brehm P , Heintz N
Ref : Neuron , 43 :305 , 2004
Abstract : The physiologies of cells depend on electrochemical signals carried by ion channels and receptors. Venomous animals produce an enormous variety of peptide toxins with high affinity for specific ion channels and receptors. The mammalian prototoxin lynx1 shares with alpha-bungarotoxin the ability to bind and modulate nicotinic receptors (nAChRs); however, lynx1 is tethered to the membrane via a GPI anchor. We show here that several classes of neurotoxins, including bungarotoxins and cobratoxins, retain their selective antagonistic properties when tethered to the membrane. Targeted elimination of nAChR function in zebrafish can be achieved with tethered alpha-bungarotoxin, silencing synaptic transmission without perturbing synapse formation. These studies harness the pharmacological properties of peptide toxins for use in genetic experiments. When combined with specific methods of cell and temporal expression, the extension of this approach to hundreds of naturally occurring peptide toxins opens a new landscape for cell-autonomous regulation of cellular physiology in vivo.
ESTHER : Ibanez-Tallon_2004_Neuron_43_305
PubMedSearch : Ibanez-Tallon_2004_Neuron_43_305
PubMedID: 15294139