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. 1991 Oct;57(10):2975–2980. doi: 10.1128/aem.57.10.2975-2980.1991

Taxonomic relationships among strains of the anaerobic bacterium Bacteroides ruminicola determined by DNA and extracellular polysaccharide analysis.

B M Mannarelli 1, L D Ericsson 1, D Lee 1, R J Stack 1
PMCID: PMC183907  PMID: 1746957

Abstract

DNA and extracellular polysaccharide (EPS) analyses were performed on 14 strains of Bacteroides ruminicola. The guanine-plus-cytosine (G+C) base contents, determined from the buoyant densities of chromosomal DNAs, showed a broad range of values, from 37.6 to 50.9 mol%. DNA hybridization showed generally low DNA relatedness among the strains. Seven strains formed two groups of closely related bacteria consisting of five (group 1) and two (group 2) strains, and another strain, E42g, showed moderate relatedness to group 1 strains. However, the remaining six strains were not related to any of the other strains. DNA reassociation indicates that the strains constitute a genetically diverse group representing as many as nine separate species. EPS analysis showed that the strains produced EPS with rather uniform sugar compositions, which did not correlate with strain relationships determined by DNA analysis. Four strains had EPS with acidic sugars or unknown compounds. The EPS of strain 20-63 contained the unusual acidic sugar 4-O-(1-carboxyethyl)-rhamnose. This monosaccharide has been shown to occur in nature in only one other bacterial species.

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Selected References

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