A synthetic peptide derived from p34cdc2 is a specific and efficient substrate of src-family tyrosine kinases - PubMed (original) (raw)
. 1992 May 5;267(13):9248-56.
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- PMID: 1577758
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A synthetic peptide derived from p34cdc2 is a specific and efficient substrate of src-family tyrosine kinases
H C Cheng et al. J Biol Chem. 1992.
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Abstract
A peptide derived from p34cdc2, cdc2(6-20)NH2 with the amino acid sequence of KVEKIGEGTYGVVYK-amide, was found to be a specific and efficient substrate for a pp60c-src-related protein tyrosine kinase from bovine spleen (STK). Glu-12 and Thr-14 were identified to be substrate specificity determinants in this peptide (Cheng, H.-C., Litwin, C. M. E., Hwang, D. M., and Wang, J. H. (1991) J. Biol. Chem. 266, 17919-17925). In this study, we demonstrated the presence of cdc2(6-20)NH2 peptide tyrosine kinase activity in the membrane fractions of bovine brain, spleen, thymus, lung, liver, and kidney. Hydroxylapatite column chromatography of thymus membrane extract revealed four protein tyrosine kinases, TK-I, TK-II, TK-III, and TK-IV, with different relative activities toward cdc2(6-20)NH2 and a general tyrosine kinase substrate, poly(Glu/Tyr). Only TK-I and TK-II showed significant activity toward cdc2(6-20)NH2, they were suggested as belonging to the src-family by virtue of their cross-reactivity with an antibody against a synthetic peptide corresponding to a conserved sequence of src-family kinases. Further immunological characterization using antibodies specific to individual src-related protein tyrosine kinases suggested that TK-I, TK-II, and STK are bovine homologs of p56lck, p55fyn, and p56lyn, respectively. Substrate specificity and kinetic characterization of src-family tyrosine kinases including human platelet pp60c-src, bovine p56lyn, p56lck, and p55fyn, as well as several non-src-related tyrosine kinases including epidermal growth factor receptor, p43v-abl, TK-III, and TK-IV showed that all the src-family tyrosine kinases but none of the other kinases displayed efficient cdc2(6-20)NH2 phosphorylation. In all cases, the high efficiency of cdc2(6-20)NH2 peptide phosphorylation could be markedly attenuated when Glu-12 and Thr-14 of the peptide were substituted, respectively, by valine and serine.
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