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

Joshua Stone, Mark Mayo, Stephanie Grasso, Jennifer 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 Keim, Apichai Tuanyok

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    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
    Number of pages8
    JournalBMC Microbiology
    Volume12
    Issue numberArticle 250
    DOIs
    Publication statusPublished - 2012

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