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Human complement factor I: its expression by insect cells and its biochemical and structural characterisation

C G Ullman1, D Chamberlain, A Ansari

  • 1Department of Biochemistry and Molecular Biology, Royal Free Hospital School of Medicine, London, UK.

Molecular Immunology
|November 11, 1998
PubMed
Summary
This summary is machine-generated.

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Recombinant factor I (rFI) was successfully produced and characterized. While rFI exhibits similar protein folding to serum-derived factor I (sFI), its altered glycosylation results in reduced complement system regulatory activity.

Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Factor I is a crucial plasma serine protease regulating the complement system.
  • Understanding Factor I's structure and function is vital for complement-mediated disease research.

Purpose of the Study:

  • To express and characterize recombinant factor I (rFI) using a baculovirus system.
  • To compare the biochemical and structural properties of rFI with serum-derived factor I (sFI).

Main Methods:

  • Cloning of the factor I coding sequence into a recombinant baculovirus vector.
  • Expression in Trichoplusia ni cells and purification of rFI.
  • SDS-PAGE, N-terminal sequencing, C3(NH,) cleavage assays, circular dichroism, and Fourier transform infrared spectroscopy.

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Main Results:

  • rFI was secreted and correctly processed into two chains, with molecular weights differing from sFI due to altered glycosylation (high mannose vs. complex-type oligosaccharides).
  • rFI displayed 55% of the C3(NH,) cleavage activity of sFI.
  • Spectroscopic analyses revealed highly similar protein folding and secondary structures (low alpha-helix, high beta-sheet) between rFI and sFI.

Conclusions:

  • The reduced activity of rFI is likely due to its altered glycosylation pattern.
  • The availability of rFI facilitates further studies into its interactions with complement system components like factor H and C3b.
  • This research provides a foundation for investigating the molecular basis of factor I function and its role in complement regulation.