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Related Experiment Videos

Multiple forms of complement C3 in trout that differ in binding to complement activators

J O Sunyer1, I K Zarkadis, A Sahu

  • 1Department of Pathology, University of Pennsylvania, Philadelphia 19104-6079.

Proceedings of the National Academy of Sciences of the United States of America
|August 6, 1996
PubMed
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Trout possess multiple functional complement component C3 (C3) proteins, arising from distinct genes. These C3 variants exhibit differences in binding capabilities to various activators.

Area of Science:

  • Immunology
  • Genetics
  • Biochemistry

Background:

  • The complement component C3 (C3) is crucial for innate and adaptive immunity.
  • Typically, C3 is encoded by a single gene across most species.

Purpose of the Study:

  • To identify and characterize multiple functional C3 proteins in trout.
  • To investigate the genetic basis and functional variations of trout C3.

Main Methods:

  • Protein purification and characterization (electrophoresis, glycosylation analysis).
  • Antibody-based reactivity assays.
  • Binding assays with complement activators (zymosan, E. coli, erythrocytes).
  • Partial amino acid sequencing.

Main Results:

Related Experiment Videos

  • Three distinct functional C3 proteins (C3-1, C3-3, C3-4) were identified in trout.
  • These proteins originate from at least two separate C3 genes.
  • The C3 variants differ in electrophoretic mobility, glycosylation, antibody reactivity, and binding affinity to activators.
  • Amino acid sequence similarity between C3-3 and C3-4 is high (87/91%), while similarity to C3-1 is lower (51.5-60.5% identity).

Conclusions:

  • Trout have evolved multiple C3 genes, producing diverse functional C3 proteins.
  • These C3 variants display differential functional properties, particularly in activator binding.
  • This genetic diversity in C3 may confer adaptive advantages in immune response to various pathogens.