title: The amino acid sequence and gene organization of the heavy chain of the HLA-DR antigen: homology to immunoglobulins.
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).
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002462:Cell Membrane / Q000276:immunology; D003001:Cloning, Molecular; D003201:Computers; D004247:DNA / Q000032:analysis; D005260:Female; D005333:Fetus; D005796:Genes; D005802:Genes, MHC Class II; D006684:HLA-DR Antigens; D006801:Humans; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D008099:Liver / Q000276:immunology; D008285:Major Histocompatibility Complex; D011247:Pregnancy
chemical_list: D006684:HLA-DR Antigens; D007143:Immunoglobulin Heavy Chains; D004247:DNA