Characterization of the type III capsular polysaccharide produced by Burkholderia pseudomallei

Shauna L. Reckseidler-Zenteno, Duber Frey Viteri, Richard Moore, Erica Wong, Apichai Tuanyok, Donald E. Woods

    Research output: Contribution to journalJournal Articlepeer-review

    20 Citations (Scopus)

    Abstract

    Burkholderia pseudomallei has been shown to produce more than one capsular polysaccharide (CPS). Analysis of the B. pseudomallei genome has revealed that the organism contains four CPS operons (I-IV). One of these operons (CPS III) was selected for further study. Comparative sequencing analysis revealed that the genes encoding CPS III are present in B. pseudomallei and Burkholderia thailandensis but not in Burkholderia mallei. In this study, CPS III was not found to contribute to the virulence of B. pseudomallei. Strains containing mutations in CPS III had the same LD50 value as the wild-type when tested in an animal infection model. Production of CPS III was shown to be induced in water but inhibited in 30% normal human serum using a lux reporter fusion assay. Microarray analysis of capsule gene expression in infected hamsters revealed that the genes encoding CPS III were not significantly expressed in vivo compared with the genes encoding the previously characterized mannoheptose capsule (CPS I), which is an important virulence factor in B. pseudomallei. Glycosyl-composition analysis by combined GC/MS indicated that the CPS III genes are involved in the synthesis of a capsule composed of galactose, glucose, mannose and xylose.

    Original languageEnglish
    Pages (from-to)1403-1414
    Number of pages12
    JournalJournal of Medical Microbiology
    Volume59
    Issue number12
    DOIs
    Publication statusPublished - Dec. 2010

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