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Related Experiment Videos

PspC, a pneumococcal surface protein, binds human factor H.

S Dave1, A Brooks-Walter, M K Pangburn

  • 1Department of Microbiology, The University of Mississippi Medical Center, Jackson, Mississippi 39216, USA.

Infection and Immunity
|April 9, 2001
PubMed
Summary
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Pneumococcal surface protein C (PspC) strongly binds human complement factor H (FH). This binding varies among different pneumococcal isolates, highlighting PspC

Area of Science:

  • Microbiology
  • Immunology
  • Molecular Biology

Background:

  • Streptococcus pneumoniae pathogenesis involves interactions with host immune factors.
  • Complement factor H (FH) plays a crucial role in regulating the host immune response.
  • Pneumococcal surface protein C (PspC) is a known virulence factor, but its interaction with FH requires further elucidation.

Purpose of the Study:

  • To investigate the direct binding interaction between PspC and human complement factor H (FH).
  • To compare the FH-binding capabilities of PspC with PspA.
  • To assess the variability of FH binding to different pneumococcal isolates.

Main Methods:

  • Western blot analysis was used to detect FH binding to PspC.
  • Purified PspC protein was utilized to confirm direct binding.

Related Experiment Videos

  • Fluorescence-activated cell sorting (FACS) analysis quantified FH binding to whole pneumococcal cells.

    • Main Results:

    • Pneumococcal surface protein C (PspC) demonstrated strong binding to human complement factor H (FH).
    • PspA was confirmed not to bind FH, differentiating it from PspC.
    • Significant variation in FH binding was observed across different pneumococcal isolates.

    Conclusions:

    • PspC is a direct high-affinity binding protein for human complement factor H.
    • The differential binding of FH by PspC suggests a role in immune evasion strategies of Streptococcus pneumoniae.
    • Isolate-specific variations in FH binding mediated by PspC warrant further investigation into their clinical relevance.