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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1982 Oct;79(20):6337–6341. doi: 10.1073/pnas.79.20.6337

cDNA clone for the heavy chain of the human B cell alloantigen DC1: strong sequence homology to the HLA-DR heavy chain.

C Auffray, A J Korman, M Roux-Dosseto, R Bono, J L Strominger
PMCID: PMC347116  PMID: 6815651

Abstract

A cDNA library has been constructed from a B cell mRNA fraction enriched for HLA-DR sequences, and cDNA clones corresponding to sequences specifically expressed in B lymphocytes have been isolated by a differential screening procedure. Analysis of these clones with probes specific for the HLA-DR heavy chain gene allowed the characterization of HLA-DR heavy chain-related sequences. One clone, pDCH1, was demonstrated to encode the DC1 heavy chain because the amino acid sequence predicted from its nucleotide sequence matches eight out of nine residues available for comparison in the amino-terminal sequence of the DC1 heavy chain. The heavy chain of the DC1 alloantigen is composed of 232 amino acids and can be divided into two external domains, alpha 1 (amino acids 1-87) and alpha 2 (amino acids 88-181), a connecting peptide (amino acids 182-194), a hydrophobic transmembrane region (amino acids 195-217), and an intracytoplasmic region (amino acids 218-232). Comparison with the HLA-DR heavy chain reveals strong sequence homology in the second external Ig-like domain (alpha 2) and the transmembrane region. In contrast, the first external domain, the connecting peptide, and the intracytoplasmic region are less conserved.

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Selected References

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