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,
Departments of
*
Microbiology,
Surgery, and
Medicine, University of Mississippi Medical Center, Jackson, MS 39216;
Department of Microbial Pathogenesis, German Research Centre for Biotechnology, Braunschweig, Germany; and
¶ Department of Biochemistry, University of Texas Health Science Center, Tyler, TX 75708
Streptococcus pneumoniae, also known as the pneumococcus, contains several surface proteins that along with the polysaccharide capsule function in antiphagocytic activities and evasion of the host immune system. These pneumococcal proteins interact with the host immune system in various ways and possess a wide range of biological activities that suggests that they may be involved at different stages of pneumococcal infection. PspC, also known as CbpA and SpsA, is one of several pneumococcal surface proteins that binds host proteins, including factor H (FH) and secretory IgA (sIgA) via the secretory component. Previous work by our laboratory has demonstrated that PspC on the surface of live pneumococcal cells binds FH. This paper provides evidence that FH activity is maintained in the presence of PspC and that the PspC binding site is located in the short consensus repeat 610 region of FH. We also report for the first time that although both FH and sIgA binding has been localized to the
-helical domain of PspC, the binding of FH to PspC is not inhibited by sIgA. ELISA, surface plasmon resonance, and flow cytometry indicate that the two host proteins do not compete for binding with PspC and likely do not share the same binding sites. We confirmed by Western analysis that the binding sites are separate using recombinant PspC proteins. These PspC variants bind FH yet fail to bind sIgA. Thus, we conclude that FH and sIgA can bind concurrently to the
-helical region of PspC.
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