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Structural conservation of hypervariable regions in immunoglobulins evolution

S Barré1, A S Greenberg, M F Flajnik

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK.

Nature Structural Biology
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

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The study reveals that key protein structures in the immune system, known as canonical structures, are conserved across species. These structures, crucial for antigen binding, likely emerged early in immune system evolution.

Area of Science:

  • Immunology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Immunoglobulins, crucial for adaptive immunity, possess antigen-binding sites formed by hypervariable regions.
  • Canonical structures, specific main-chain conformations, characterize these hypervariable regions in humans and mice.
  • Cartilaginous fishes represent an evolutionarily distant lineage from humans, diverging 450 million years ago, yet possess an immune system.

Purpose of the Study:

  • To investigate the evolutionary conservation of immunoglobulin canonical structures.
  • To compare hypervariable region conformations in cartilaginous fishes with those in mammals.

Main Methods:

  • Analysis of VH and V kappa gene sequences from cartilaginous fishes.
  • Comparison of identified hypervariable region conformations with known human and mouse canonical structures.

Related Experiment Videos

Main Results:

  • Cartilaginous fishes share common canonical structures in L1, L2, H1, and H2 hypervariable regions with humans and mice.
  • One common canonical structure was also identified in the L3 hypervariable region of fish immunoglobulins.

Conclusions:

  • The findings suggest that the most prevalent canonical structures in immunoglobulin hypervariable regions are ancient.
  • These conserved structures likely originated early in the evolution of the vertebrate immune system.