Nov 1, 1986

Isozymic forms of rat brain Ca2+-activated and phospholipid-dependent protein kinase

Proceedings of the National Academy of Sciences of the United States of America
K P HuangF L Huang


Three forms of rat brain Ca2+-activated and phospholipid-dependent protein kinase (EC were separated by hydroxylapatite column chromatography. These enzymes, designated type I, II, and III protein kinase C, all have a molecular weight of 82,000, undergo autophosphorylation in the presence of Ca2+, phosphatidylserine, and diolein, and bind [3H]phorbol 12,13-dibutyrate. Autophosphorylation of these kinases resulted in an incorporation of 1-1.5 mol of 32P per mol of enzyme. Two-dimensional peptide mapping analysis revealed that these kinases had different sites of autophosphorylation. Phosphoamino acid analysis showed that type I and type III protein kinase C primarily autophosphorylated at a serine residue, whereas type II kinase autophosphorylated at both serine and threonine residues. In addition, polyclonal antibodies raised against a mixture of three types of the kinase preferentially inhibited type I and type II enzymes. Monoclonal antibodies against type I and type II kinase only recognized their respective enzymes but not the type III enzyme. These results demonstrate the presence of isozymic forms of protein kinase C in rat brain.

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Mentioned in this Paper

Monoclonal Antibodies
Monoclonal antibodies, antineoplastic
Peptide Mapping
Enzymes, antithrombotic
LIM Domain Kinase 1
3-Phosphoinositide Dependent Protein Kinase-1

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