Abstract

Crystal Structure of a Bony Fish β2-Microglobulin: INSIGHTS INTO THE EVOLUTIONARY ORIGIN OF IMMUNOGLOBULIN SUPERFAMILY CONSTANT MOLECULES

Highlights

  • Three-dimensional structures of ␤2-microglobulin (␤2m) from chicken and various mammals have been described previously, but aside from genomic sequences, very little is known about the three-dimensional structures of ␤2m in species other than warm-blooded vertebrates

  • ␤2-microglobulin (␤2m)3 is classified as part of the set of immunoglobulin superfamily (IgSF) constant (C) proteins based on its amino acid sequence, number of strands, and folding topology [1, 2]

  • One form is composed of IgSF domains, comprising the B cell receptor, the major histocompatibility complex (MHC) and the T cell receptor (TCR), in which IgSF C is combined with the IgSF variable (V) domain [3]

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Summary

We have reported previously a representative bony fish grass carp

␤2m (Ctid-␤2m) gene [17]. We resolved the first three-dimensional structure of Ctid-␤2m at 2.1. Å. Ctid-␤2m closely resembles the previously described human and bovine monomeric ␤2m structures, with some significant variations

Two new hydrogen bonds and a hydrophobic pocket were found in
RESULTS
Refinement statistics
The Unusual Flexible CD Loop in
DISCUSSION
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