Detection of Burkholderia pseudomallei O-antigen serotypes in near-neighbor species

Joshua Stone, Mark Mayo, Stephanie Grasso, Jennifer L Ginther, Stephanie Warrington, Christopher Allender, Adina Doyle, Shalamar Georgia, Mirjam Kaestli, Stacey Broomall, Mark Karavis, Joseph Insalaco, Kyle Hubbard, Lauren McNew, Henry Gibbons, Bart Currie, Paul S Keim, Apichai Tuanyok

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    Abstract

    Background: Burkholderia pseudomallei is the etiological agent of melioidosis and a CDC category B select agent with no available effective vaccine. Previous immunizations in mice have utilized the lipopolysaccharide (LPS) as a potential vaccine target because it is known as one of the most important antigenic epitopes in B. pseudomallei. Complicating this strategy are the four different B. pseudomallei LPS O-antigen types: A, B, B2, and rough. Sero-crossreactivity is common among O-antigens of Burkholderia species. Here, we identified the presence of multiple B. pseudomallei O-antigen types and sero-crossreactivity in its near-neighbor species.

    Results: PCR screening of O-antigen biosynthesis genes, phenotypic characterization using SDS-PAGE, and immunoblot analysis showed that majority of B. mallei and B. thailandensis strains contained the typical O-antigen type A. In contrast, most of B. ubonensis and B. thailandensis-like strains expressed the atypical O-antigen types B and B2, respectively. Most B. oklahomensis strains expressed a distinct and non-seroreactive O-antigen type, except strain E0147 which expressed O-antigen type A. O-antigen type B2 was also detected in B. thailandensis 82172, B. ubonensis MSMB108, and Burkholderia sp. MSMB175. Interestingly, B. thailandensis-like MSMB43 contained a novel serotype B positive O-antigen.

    Conclusions: This study expands the number of species which express B. pseudomallei O-antigen types. Further work is required to elucidate the full structures and how closely these are to the B. pseudomallei O-antigens, which will ultimately determine the efficacy of the near-neighbor B serotypes for vaccine development.
    Original languageEnglish
    Article number250
    Pages (from-to)1-8
    Number of pages8
    JournalBMC Microbiology
    Volume12
    DOIs
    Publication statusPublished - 2012

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