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Related Experiment Videos

Origin of bovine IgM structural variants.

S S Saini1, A Kaushik

  • 1Department of Pathobiology, University of Guelph, Ont., N1G 2W1, Guelph, Canada.

Molecular Immunology
|October 31, 2001
PubMed
Summary

Researchers identified three bovine immunoglobulin M (IgM) allotypes (IgMa, IgMb, IgMc) and structural features influencing antigen recognition and complement activation. Bovine IgM exhibits unique structural constraints potentially enhancing its complement-fixing ability.

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Area of Science:

  • Immunology
  • Structural Biology
  • Genetics

Background:

  • Immunoglobulin M (IgM) is a crucial antibody in the innate immune system.
  • Understanding the structural basis of bovine IgM function is essential for immunology and animal health.
  • Previous studies have not fully elucidated the structural nuances of bovine IgM and their functional implications.

Purpose of the Study:

  • To determine the structure of bovine IgM and compare it with other species.
  • To identify bovine IgM allotypes and investigate mechanisms generating IgM variants.
  • To analyze structural features related to antigen recognition, complement activation, and evolutionary conservation.

Main Methods:

  • Isolation and sequencing of two bovine IgM cDNAs.
  • Comparative sequence analysis at nucleotide and amino acid levels.

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  • Identification of allotypes and alternative splicing events.
  • Analysis of conserved residues, proline content, and C1q-binding sites.
  • Restricted fragment length polymorphism (RFLP) analysis of genomic DNA.

    • Main Results:

    • High sequence similarity (98.7% nucleotide, 97.9% amino acid) was found between two bovine IgM cDNAs, closely related to sheep IgM (89.4%).
    • Three bovine IgM allotypes (IgMa, IgMb, IgMc) were classified based on substitutions in Cmu exons.
    • Alternative splicing generated additional bovine IgM variants.
    • A conserved C1q-binding site was identified in bovine IgM.
    • Bovine IgM Cmu2 domain has fewer proline residues (5) than other species (7-9), potentially increasing Fab arm rigidity.
    • Additional hydrophilic residues (threonine, serine) in Cmu2 enhance solvent extension.
    • At least four allelic variants of the bovine Cmu gene were detected across four cattle breeds.

    Conclusions:

    • Bovine IgM exhibits unique structural characteristics, including reduced proline content in Cmu2, which may enhance complement fixation by facilitating C1q-binding site exposure.
    • The rigidity of bovine IgM Fab arms might favor the selection of antibodies with long CDR3H regions, influencing antigen recognition.
    • The identified allotypes and allelic variants contribute to the diversity of bovine IgM, impacting immune responses.