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. 1982 Oct;79(19):6013–6017. doi: 10.1073/pnas.79.19.6013

The amino acid sequence and gene organization of the heavy chain of the HLA-DR antigen: homology to immunoglobulins.

A J Korman, C Auffray, A Schamboeck, J L Strominger
PMCID: PMC347042  PMID: 6821129

Abstract

The amino acid sequence of the heavy chain of HLA-DR antigens has been elucidated from the analysis of a genomic clone coding for this protein. A 3.2-kilobase EcoRI fragment includes four exons containing 227 amino acids out of 229 in the mature HLA-DR heavy chain. One exon (alpha 2) encodes a domain of 94 amino acids with strong sequence homology both to Ig constant region domains and to Ig-like domains in HLA-B7, beta 2-microglobulin, and the HLA-DR light chain. These results support a structure for the HLA-DR antigen heterodimer consisting of four extracellular domains, two of which are Ig-like [one in the heavy chain (alpha 2) and one in the light chain (beta 2)]. The third is the amino-terminal polymorphic domain in the light chain (beta 1), and the fourth is an invariant domain in the heavy chain (alpha 1).

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Selected References

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