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Related Experiment Videos

The factor H protein family.

P F Zipfel1, T S Jokiranta, J Hellwage

  • 1Research Group of Biomolecular Medicine, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany. zipfel@uke.uni-hamburg.de

Immunopharmacology
|July 17, 1999
PubMed
Summary

The factor H gene family comprises six secreted proteins, primarily involved in complement control. These multifunctional proteins regulate immune responses and exhibit diverse roles beyond the complement system.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Protein Science

Background:

  • The factor H gene family consists of six secreted, multifunctional proteins synthesized mainly in the liver.
  • These proteins share conserved structural elements and exhibit diverse, often overlapping functions.

Purpose of the Study:

  • To summarize the current understanding of the factor H protein family's functions.
  • To propose a common role for these proteins in complement control.

Main Methods:

  • Review of existing literature on factor H family members.
  • Analysis of protein structure-function relationships.
  • Summary of experimental findings on protein interactions and activities.

Main Results:

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  • Factor H, the best-characterized member, regulates complement by degrading C3b and accelerating decay of C3 convertase.
  • Factor H also exhibits non-complement functions, including binding to integrin receptors, glycosaminoglycans, and pathogens.
  • Factor H-like protein 1 (FHL-1) shares complement regulatory roles and interacts with heparin, promoting cell spreading.
  • Factor H-related proteins (FHR-1 to FHR-4) have varied distributions and functions, with some binding C3b/C3d and showing cofactor activity.

Conclusions:

  • The factor H gene family plays a crucial role in regulating complement system activity.
  • These proteins possess multifaceted functions extending beyond complement control, highlighting their broad biological significance.
  • Further investigation into FHR proteins is needed to fully elucidate their roles.