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p36 is a major substrate of both viral and growth factor-receptor-associated tyrosine protein kinases. p36 can be isolated as a complex consisting of a subunit of Mr 36,000 (p36) and a subunit of Mr 10,000 (p10), and it represents an abundant cellular protein. We have isolated the p36-p10 complex from bovine intestinal epithelium and analyzed the amino terminus of both subunits. Sequence analysis of the first 56 amino acids of p10 demonstrates a striking sequence homology (48% identically placed residues) with the Mr 10,000 calcium-binding proteins from bovine brain, termed S-100. Intestinal p36 could be effectively labeled on a single tyrosine in vitro with immunoprecipitated pp60v-src and [gamma-32P]ATP. Mild proteolysis of p36 with chymotrypsin resulted in the cleavage into large (Mr, 33,000) and small domains (Mr, 3000), with the latter representing the phosphorylated amino terminus. Although the amino terminus is apparently blocked, sequence analysis of a secondary tryptic peptide of the Mr 3000 fragment as well as the amino-terminal sequence of the Mr 33,000 domain and overlapping peptides clearly established the site of tyrosine phosphorylation.

Amino-terminal sequence of p36 and associated p10: identification of the site of tyrosine phosphorylation and homology with S-100.