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Primary structure of cobra complement component C3.

D C Fritzinger1, E C Petrella, M B Connelly

  • 1Department of Biochemistry and Molecular Biology, Georgetown University, Washington, DC 20007.

Journal of Immunology (Baltimore, Md. : 1950)
|December 1, 1992
PubMed
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Researchers cloned cobra C3 and determined its mRNA and protein structure. This study provides insights into complement component C3 structure-function relationships by comparing it to mammalian C3.

Area of Science:

  • Immunology
  • Biochemistry
  • Molecular Biology

Background:

  • Complement component C3 is a key multifunctional protein in the immune system, interacting with numerous plasma proteins and cell surface receptors.
  • Cobra venom factor (CVF) is a structural analog of C3, sharing some functions like C3/C5 convertase formation but differing in regulatory susceptibility.
  • Understanding structural differences between C3 and CVF can illuminate functionally critical regions of C3.

Purpose of the Study:

  • To elucidate the primary structure of cobra C3 mRNA and its derived protein.
  • To compare the structural features of cobra C3 with mammalian C3 to identify conserved and divergent regions.
  • To gain insights into the functional domains of C3 by analyzing its structural relationship with CVF.

Main Methods:

Related Experiment Videos

  • Molecular cloning of cobra C3 and cobra venom factor.
  • Determination of the primary structure of cobra C3 mRNA (5211 bp).
  • Analysis of the derived protein structure, including signal sequence, beta-chain, and alpha-chain.

Main Results:

  • Cobra C3 mRNA contains an open reading frame encoding a pre-pro-C3 molecule with distinct signal, beta, and alpha chains.
  • Cobra C3 shows approximately 58% nucleotide and 52% protein sequence identity (71% similarity) to mammalian C3.
  • Key functional sites, including the C3 convertase cleavage site, thioester site, and factor B binding site, are highly conserved.

Conclusions:

  • The primary structure of cobra C3 has been determined, revealing significant homology to mammalian C3, particularly in critical functional regions.
  • Conserved cysteine residues and functional sites suggest shared evolutionary origins and conserved roles in complement activation.
  • Further studies are needed to definitively determine the presence and significance of CR2 and CR3 binding sites in cobra C3.