title: A human gene family with sequence homology to Drosophila melanogaster Hsp70 heat shock genes.
abstract: A growing literature describes the structure and regulation of prokaryotic and eukaryotic heat shock genes. We here report the isolation of several members of a human heat shock protein 70 (hsp 70) multigene family which contains at least 10 different genes and/or pseudogenes exhibiting sequence homology to the hsp70 gene of Drosophila melanogaster. Eight nonoverlapping recombinant lambda phages from a lambda-Charon4A human genomic library were studied by restriction mapping. One lambda clone was sequenced and characterized as a hsp70 pseudogene inserted into a rearranged human HindIII 1.9-kilobase repeated DNA sequence. This pseudogene is probably located on the X chromosome. Its predicted amino acid sequence shows extensive homology to those of Drosophila hsp70, trout hsp70, Xenopus hsp70, yeast hsp70, and some homology to the heat-inducible dnaK gene product of Escherichia coli. Amino acid homology is clustered, suggesting evolutionary conservation of domains critical to the function of this protein in both prokaryotic and eukaryotic cells.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004262:DNA Restriction Enzymes / Q000378:metabolism; D004331:Drosophila melanogaster / Q000235:genetics*; D005796:Genes; D006360:Heat-Shock Proteins / Q000235:genetics*; D006801:Humans
chemical_list: D006360:Heat-Shock Proteins; D004262:DNA Restriction Enzymes