A synthetic peptide analog of the putative substrate-binding motif activates protein kinase C - PubMed (original) (raw)
A synthetic peptide analog of the putative substrate-binding motif activates protein kinase C
C House et al. FEBS Lett. 1989.
Free article
Abstract
A 29-residue synthetic peptide, Leu530-Leu-Tyr-Glu-Met-Leu-Ala-Gly-Gln-Ala-Pro-Phe-Glu-Gly-Glu-Asp -Glu-Asp- Glu-Leu-Phe-Gln-Ser-Ile-Met-Glu-His-Asn-Val-NH2(558), corresponding to part of the catalytic domain of protein kinase C, is a potent activator of the enzyme, with a Ka of approx. 10 microM. Activation was 59 +/- 4% of that observed with phosphatidylserine, predominantly due to an increased Vmax, partially calcium-dependent, observed with all three isoenzymes (alpha, beta, gamma), and resulted in autophosphorylation. It is proposed that the region between Gly528 and Arg583 is part of the protein substrate binding region of protein kinase C and synthetic peptide analogs of this region activate the enzyme by blocking the action of the enzyme's basic pseudosubstrate autoregulatory region.
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