The Vibrio cholerae genome contains two unique circular chromosomes
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TLDR
The most notable finding is that the V. cholerae chromosome appears to be not the single chromosome reported but two unique and separate circular megareplicons.Abstract:
Vibrio cholerae, the etiologic agent of the diarrheal disease cholera, is a Gram-negative bacterium that belongs to the γ subdivision of the family Proteobacteriaceae. The physical map of the genome has been reported, and the genome has been described as a single 3.2-Mb chromosome [Majumder, R., et al. (1996) J. Bacteriol. 178, 1105–1112]. By using pulsed-field gel electrophoresis of genomic DNA immobilized in agarose plugs and digested with the restriction enzymes I-CeuI, SfiI, and NotI, we have also constructed the physical map of V. cholerae. Our analysis estimates the size of the genome at 4.0 Mb, 25% larger than the physical map reported by others. Our most notable finding is, however, that the V. cholerae chromosome appears to be not the single chromosome reported but two unique and separate circular megareplicons.read more
Citations
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Journal ArticleDOI
DNA sequence of both chromosomes of the cholera pathogen Vibrio cholerae
John F. Heidelberg,Jonathan A. Eisen,William C. Nelson,Rebecca A. Clayton,Michelle L. Gwinn,Robert J. Dodson,Daniel H. Haft,Erin Hickey,Jeremy Peterson,Lowell Umayam,Steven R. Gill,Karen E. Nelson,Timothy D. Read,Hervé Tettelin,Delwood Richardson,Maria D. Ermolaeva,Jessica Vamathevan,Steven Bass,Haiying Qin,Ioana Dragoi,Patrick Sellers,Lisa McDonald,Teresa Utterback,Robert D. Fleishmann,William C. Nierman,Owen White,Steven L. Salzberg,Hamilton O. Smith,Rita R. Colwell,Rita R. Colwell,John J. Mekalanos,J. Craig Venter,Claire M. Fraser +32 more
TL;DR: The V. cholerae genomic sequence provides a starting point for understanding how a free-living, environmental organism emerged to become a significant human bacterial pathogen.
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TL;DR: The mechanisms of siderophore biosynthesis follow the same fundamental enzymatic logic, which involves a series of elongating acyl-S-enzyme intermediates on multimodular protein assembly lines: nonribosomal peptide synthetases (NRPS).
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A Vibrio cholerae pathogenicity island associated with epidemic and pandemic strains
David K. R. Karaolis,Judith A. Johnson,Camella C. Bailey,Edgar C. Boedeker,James B. Kaper,Peter R. Reeves +5 more
TL;DR: A chromosomal pathogenicity island that is present in epidemic and pandemic strains but absent from nonpathogenic strains but found in two clinical non-O1/non-O139 cholera toxin-positive strains is found, suggesting that it can be transferred within V. cholerae.
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