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Identification and characterization of a human Vlambda5 (T1) germline gene that encodes structurally unique lambda

A Solomon1, D T Weiss, M Schell

  • 1Department of Medicine, University of Tennessee Medical Center/Graduate School of Medicine, Knoxville 37920, U.S.A.

Molecular Immunology
|April 1, 1997
PubMed
Summary

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The Vlambda5 gene family encodes unique lambda light chains with distinct structural features in CDR2 and FR3 regions. These conserved elements suggest significant biological and functional importance in the human immune system.

Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Protein Structure

Background:

  • The human germline Vlambda repertoire comprises ~30 genes in 10 families, classified by sequence homology.
  • The Vlambda5 family is notable for unique structural characteristics in its lambda light chain products.

Purpose of the Study:

  • To isolate and characterize a member of the Vlambda5 gene family from human genomic DNA.
  • To compare the structural features of Vlambda5 proteins with other Vlambda gene families.

Main Methods:

  • Polymerase chain reaction (PCR) was used to generate a probe for isolating the IGLV5-1 gene.
  • Genomic DNA and cDNA from plasma cells were analyzed.
  • Predicted protein sequences were compared across different Vlambda gene families.

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Main Results:

  • The IGLV5-1 gene, a Vlambda5 family member, was isolated and found to be a potentially functional gene.
  • Vlambda5 proteins exhibit unique primary structural features, with extra amino acids in CDR2 (11 vs. 7) and FR3 (34 vs. 32).
  • These features are conserved across species and resemble those of VpreB components.

Conclusions:

  • The Vlambda5 gene family possesses distinctive structural attributes in its encoded light chains.
  • The presence of additional residues in CDR2 and FR3, conserved evolutionarily, highlights the biological and functional significance of the Vlambda5 family.