Harris LJ

References (3)

Title : Gramillin A and B: Cyclic Lipopeptides Identified as the Nonribosomal Biosynthetic Products of Fusarium graminearum - Bahadoor_2018_J.Am.Chem.Soc_140_16783
Author(s) : Bahadoor A , Brauer EK , Bosnich W , Schneiderman D , Johnston A , Aubin Y , Blackwell B , Melanson JE , Harris LJ
Ref : Journal of the American Chemical Society , 140 :16783 , 2018
Abstract : The virulence and broad host range of Fusarium graminearum is associated with its ability to secrete an arsenal of phytotoxic secondary metabolites, including the regulated mycotoxins belonging to the deoxynivalenol family. The TRI genes responsible for the biosynthesis of deoxynivalenol and related compounds are usually expressed during fungal infection. However, the F. graminearum genome harbors an array of unexplored biosynthetic gene clusters that are also co-induced with the TRI genes, including the nonribosomal peptide synthetase 8 ( NRPS8) gene cluster. Here, we identify two bicyclic lipopeptides, gramillin A (1) and B (2), as the biosynthetic end products of NRPS8. Structural elucidation by high-resolution LC-MS and NMR, including (1)H-(15)N-(13)C HNCO and HNCA on isotopically enriched compounds, revealed that the gramillins possess a fused bicyclic structure with ring closure of the main peptide macrocycle occurring via an anhydride bond. Through targeted gene disruption, we characterized the GRA1 biosynthetic gene and its transcription factor GRA2 in the NRPS8 gene cluster. Further, we show that the gramillins are produced in planta on maize silks, promoting fungal virulence on maize but have no discernible effect on wheat head infection. Leaf infiltration of the gramillins induces cell death in maize, but not in wheat. Our results show that F. graminearum deploys the gramillins as a virulence agent in maize, but not in wheat, thus displaying host-specific adaptation.
ESTHER : Bahadoor_2018_J.Am.Chem.Soc_140_16783
PubMedSearch : Bahadoor_2018_J.Am.Chem.Soc_140_16783
PubMedID: 30395461
Gene_locus related to this paper: gibze-gra11

Title : Safety of the surrogate microorganism Enterococcus faecium NRRL B-2354 for use in thermal process validation - Kopit_2014_Appl.Environ.Microbiol_80_1899
Author(s) : Kopit LM , Kim EB , Siezen RJ , Harris LJ , Marco ML
Ref : Applied Environmental Microbiology , 80 :1899 , 2014
Abstract : Enterococcus faecium NRRL B-2354 is a surrogate microorganism used in place of pathogens for validation of thermal processing technologies and systems. We evaluated the safety of strain NRRL B-2354 based on its genomic and functional characteristics. The genome of E. faecium NRRL B-2354 was sequenced and found to comprise a 2,635,572-bp chromosome and a 214,319-bp megaplasmid. A total of 2,639 coding sequences were identified, including 45 genes unique to this strain. Hierarchical clustering of the NRRL B-2354 genome with 126 other E. faecium genomes as well as pbp5 locus comparisons and multilocus sequence typing (MLST) showed that the genotype of this strain is most similar to commensal, or community-associated, strains of this species. E. faecium NRRL B-2354 lacks antibiotic resistance genes, and both NRRL B-2354 and its clonal relative ATCC 8459 are sensitive to clinically relevant antibiotics. This organism also lacks, or contains nonfunctional copies of, enterococcal virulence genes including acm, cyl, the ebp operon, esp, gelE, hyl, IS16, and associated phenotypes. It does contain scm, sagA, efaA, and pilA, although either these genes were not expressed or their roles in enterococcal virulence are not well understood. Compared with the clinical strains TX0082 and 1,231,502, E. faecium NRRL B-2354 was more resistant to acidic conditions (pH 2.4) and high temperatures (60 degrees C) and was able to grow in 8% ethanol. These findings support the continued use of E. faecium NRRL B-2354 in thermal process validation of food products.
ESTHER : Kopit_2014_Appl.Environ.Microbiol_80_1899
PubMedSearch : Kopit_2014_Appl.Environ.Microbiol_80_1899
PubMedID: 24413604

Title : The Fusarium graminearum genome reveals a link between localized polymorphism and pathogen specialization - Cuomo_2007_Science_317_1400
Author(s) : Cuomo CA , Guldener U , Xu JR , Trail F , Turgeon BG , Di Pietro A , Walton JD , Ma LJ , Baker SE , Rep M , Adam G , Antoniw J , Baldwin T , Calvo S , Chang YL , Decaprio D , Gale LR , Gnerre S , Goswami RS , Hammond-Kosack K , Harris LJ , Hilburn K , Kennell JC , Kroken S , Magnuson JK , Mannhaupt G , Mauceli E , Mewes HW , Mitterbauer R , Muehlbauer G , Munsterkotter M , Nelson D , O'Donnell K , Ouellet T , Qi W , Quesneville H , Roncero MI , Seong KY , Tetko IV , Urban M , Waalwijk C , Ward TJ , Yao J , Birren BW , Kistler HC
Ref : Science , 317 :1400 , 2007
Abstract : We sequenced and annotated the genome of the filamentous fungus Fusarium graminearum, a major pathogen of cultivated cereals. Very few repetitive sequences were detected, and the process of repeat-induced point mutation, in which duplicated sequences are subject to extensive mutation, may partially account for the reduced repeat content and apparent low number of paralogous (ancestrally duplicated) genes. A second strain of F. graminearum contained more than 10,000 single-nucleotide polymorphisms, which were frequently located near telomeres and within other discrete chromosomal segments. Many highly polymorphic regions contained sets of genes implicated in plant-fungus interactions and were unusually divergent, with higher rates of recombination. These regions of genome innovation may result from selection due to interactions of F. graminearum with its plant hosts.
ESTHER : Cuomo_2007_Science_317_1400
PubMedSearch : Cuomo_2007_Science_317_1400
PubMedID: 17823352
Gene_locus related to this paper: fusof-f9fxz4 , gibze-a8w610 , gibze-b1pdn0 , gibze-i1r9e6 , gibze-i1rda9 , gibze-i1rdk7 , gibze-i1rec8 , gibze-i1rgs0 , gibze-i1rgy0 , gibze-i1rh52 , gibze-i1rhi8 , gibze-i1rig9 , gibze-i1rip5 , gibze-i1rpg6 , gibze-i1rsg2 , gibze-i1rv36 , gibze-i1rxm5 , gibze-i1rxp8 , gibze-i1rxv5 , gibze-i1s1u3 , gibze-i1s3j9 , gibze-i1s6l7 , gibze-i1s8i8 , gibze-i1s9x4 , gibze-ppme1 , gibze-q4huy1 , gibze-i1rg17 , gibze-i1rb76 , gibze-i1s1m7 , gibze-i1s3z6 , gibze-i1rd78 , gibze-i1rgl9 , gibze-i1rjp7 , gibze-i1s1q6 , gibze-i1ri35 , gibze-i1rf76 , gibze-i1rhp3 , gibza-a0a016pda4 , gibza-a0a016pl96 , gibze-i1rjb5 , gibze-i1rkc4 , gibze-a0a1c3ylb1 , gibze-gra11 , gibze-fsl2