Linked Life Data

12686634

Source:http://linkedlifedata.com/resource/pubmed/id/12686634

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pubmed-article:12686634pubmed:abstractTextThe important opportunistic pathogen Bacteroides fragilis is a strictly anaerobic Gram-negative bacterium and a member of the normal resident human gastrointestinal microbiota. Our earlier studies indicated that there is considerable within-strain variation in polysaccharide expression, as detected by mAb labelling. Analysis of the genome sequence has revealed multiple invertible DNA regions, designated fragilis invertible (fin) regions, seven of which are upstream of polysaccharide biosynthesis loci and are approximately 226 bp in size. Using orientation-specific PCR primers and sequence analysis with populations enriched for one antigenic type, two of these invertible regions were assigned to heteropolymeric polysaccharides with different sizes of repeating units, as determined by PAGE pattern. The implication of these findings is that inversion of the fin regions switches biosynthesis of these polysaccharides off and on. The invertible regions are bound by inverted repeats of 30 or 32 bp with striking similarity to the Salmonella typhimurium H flagellar antigen inversion cross-over (hix) recombination sites of the invertible hin region. It has been demonstrated that a plasmid-encoded Hin invertase homologue (FinB), present in B. fragilis NCTC 9343, binds specifically to the invertible regions and the recombination sites have been designated as fragilis inversion cross-over (fix) sites.lld:pubmed
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pubmed-article:12686634pubmed:pagination915-24lld:pubmed
pubmed-article:12686634pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:12686634pubmed:year2003lld:pubmed
pubmed-article:12686634pubmed:articleTitleMultiple inverted DNA repeats of Bacteroides fragilis that control polysaccharide antigenic variation are similar to the hin region inverted repeats of Salmonella typhimurium.lld:pubmed
pubmed-article:12686634pubmed:affiliationMicrobiology and Immunobiology, The Queen's University of Belfast, Grosvenor Road, Belfast BT12 6BN, UK. s.patrick@qub.ac.uklld:pubmed
pubmed-article:12686634pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12686634pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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