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. 1988 Sep 1;254(2):455–462. doi: 10.1042/bj2540455

Characterization of bovine aortic protein kinase C with histone and platelet protein P47 as substrates.

K R Dell 1, M P Walsh 1, D L Severson 1
PMCID: PMC1135099  PMID: 3178768

Abstract

A Ca2+- and phospholipid-dependent protein kinase (protein kinase C) was partially purified from the media of bovine aortas by chromatography on DEAE-Sephacel and phenyl-Sepharose. Enzyme activity was characterized with both histone and a 47 kDa platelet protein (P47) as substrates, because the properties of protein kinase C can be modified by the choice of substrate. Both phosphatidylserine and Ca2+ were required for kinase activity. With P47 as substrate, protein kinase C had a Ka for Ca2+ of 5 microM. Addition of diolein to the enzyme assay caused a marked stimulation of activity, especially at low Ca2+ concentrations, but the Ka for Ca2+ was shifted only slightly, to 2.5 microM. With histone as substrate, the enzyme had a very high Ka (greater than 50 microM) for Ca2+, which was substantially decreased to 3 microM-Ca2+ by diolein. A Triton X-100 mixed-micelle preparation of lipids was also utilized to assay protein kinase C with histone as the substrate. Under these conditions kinase activity was almost totally dependent on the presence of diolein; again, diolein caused a large decrease in the Ka for Ca2+, from greater than 100 microM to 2.5 microM. The increased sensitivity of protein kinase C to Ca2+ with P47 rather than histone, and the ability of diacylglycerol to activate protein kinase C without shifting the Ka for Ca2+, when P47 is the substrate, illustrate that the mechanism of protein kinase C activation is influenced by the exogenous substrate used to assay the enzyme.

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