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Research Article

Surface-exposed and antigenically conserved determinants of outer membrane proteins of Branhamella catarrhalis.

T F Murphy, L C Bartos
T F Murphy
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L C Bartos
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ABSTRACT

The outer membrane proteins (OMPs) of Branhamella catarrhalis were studied in an effort to identify surface-exposed determinants that are conserved among strains of the bacterium. Aliquots of polyclonal antiserum were absorbed individually by strains of B. catarrhalis. The absorbed antisera were tested in comparison with unabsorbed antiserum in an immunoblot assay against OMPs of the homologous strain. The absence of a band recognized by antibodies in the absorbed antiserum compared with the unabsorbed antiserum indicated that surface-exposed determinants of the absorbing strain cross-reacted with determinants on the homologous strain. Two antisera were absorbed individually by 20 strains of B. catarrhalis, and the absorbed sera were studied in this way in immunoblot assays. OMP E (molecular weight, ca. 56,000) expresses surface-exposed determinants that are shared among 17 of the 20 strains studied. Antibodies to OMP G (molecular weight, 28,000) were absorbed from both antisera by 14 of the 20 strains. These studies demonstrate that OMP E and OMP G express determinants that are exposed on the surface of the intact bacterium. Furthermore, these determinants are antigenically conserved among a majority of strains of B. catarrhalis. On the basis of these observations, OMPs E and G should be considered when bacterial antigens are evaluated as potential vaccine candidates.

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Surface-exposed and antigenically conserved determinants of outer membrane proteins of Branhamella catarrhalis.
T F Murphy, L C Bartos
Infection and Immunity Oct 1989, 57 (10) 2938-2941; DOI:

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Surface-exposed and antigenically conserved determinants of outer membrane proteins of Branhamella catarrhalis.
T F Murphy, L C Bartos
Infection and Immunity Oct 1989, 57 (10) 2938-2941; DOI:
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