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The SCR-17 and SCR-18 glycans in human complement factor H enhance its regulatory function.

Xin Gao1, Hina Iqbal2, Ding-Quan Yu2

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The Journal of Biological Chemistry
|August 4, 2024
PubMed
Summary
This summary is machine-generated.

Glycosylation of human complement factor H (CFH) is essential for SCR-17/18 dimer formation. This glycosylation enhances CFH binding to C3b, crucial for host cell protection.

Keywords:
analytical ultracentrifugationatomistic modelingcomplementmolecular dynamicssmall angle X-ray scatteringsurface plasmon resonance

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Area of Science:

  • Immunology
  • Glycobiology
  • Proteomics

Background:

  • Human complement factor H (CFH) regulates complement system activation, protecting host cells from damage.
  • CFH comprises 20 short complement regulator (SCR) domains and eight N-glycosylation sites.
  • Previous research identified a CFH self-association site at SCR-17/18, crucial for dimerization.

Purpose of the Study:

  • To investigate the role of N-linked glycans on SCR-17/18 in CFH dimerization.
  • To determine if glycosylation influences the interaction between CFH and C3b.
  • To elucidate the impact of glycosylation on the regulatory function of CFH.

Main Methods:

  • Expression of SCR-17/18 fragments with and without glycans in Escherichia coli.
  • Purification of full-length CFH and C-terminal fragments from human plasma and Pichia pastoris.
  • Enzymatic deglycosylation using PNGase F.
  • Analysis of dimerization using size-exclusion chromatography and analytical ultracentrifugation.
  • Assessment of CFH binding to C3b using surface plasmon resonance.

Main Results:

  • SCR-17/18 fragments expressed in E. coli lacking glycans did not form dimers.
  • Deglycosylated SCR-17/18 fragments from Pichia showed significantly reduced dimer formation.
  • Deglycosylated full-length CFH exhibited decreased binding affinity to immobilized C3b.
  • Glycosylation is necessary for SCR-17/18 dimer formation and enhances CFH's regulatory function.

Conclusions:

  • N-linked glycosylation on SCR-17/18 is critical for the dimerization of human complement factor H.
  • CFH glycosylation enhances its interaction with C3b, thereby improving complement regulation.
  • This study reveals a novel mechanism of CFH regulation dependent on glycosylation and dimerization.