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The receptor on human neutrophils (polymorphonuclear leukocytes) that mediates cellular adherence consists of two noncovalently associated subunits, designated alpha M (Mac-1 alpha, Mol alpha, or CD11b; Mr, 170,000) and beta (Mac-1 beta, Mol beta, or CD18; Mr, 100,000). We isolated a cDNA clone for the human neutrophil alpha M subunit by screening a lambda gt 11 cDNA library made from chronic myelogenous leukemia neutrophils by using an affinity-purified rabbit polyclonal antibody directed against the alpha M subunit. We used this cDNA clone to obtain additional clones from cDNA libraries made from differentiated HL-60 promyelocytic leukemia cells. Together these cDNAs constitute the complete 1137-amino acid sequence for the mature human alpha M subunit protein. The deduced amino acid sequence indicates the presence of an extensive extracellular domain with three putative metal-binding regions, (i) an amino acid region that is homologous to the A domain of von Willebrand factor, (ii) a 26-amino acid hydrophobic sequence that is a potential transmembrane domain, and (iii) a 19-amino acid cytoplasmic region. The amino acid sequence for the human neutrophil alpha M subunit contains regions that are closely related to amino acid sequences of adhesion receptors belonging to the integrin family.

cDNA sequence for the alpha M subunit of the human neutrophil adherence receptor indicates homology to integrin alpha subunits.