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J Biol Chem, Vol. 274, Issue 4, 1873-1874, January 22, 1999

COMMUNICATION
Substrate Phosphorylation in the Protein Kinase Cgamma Knockout Mouse

Geert M. J. RamakersDagger , Dan D. Gerendasy, and Pierre N. E. de GraanDagger

From the Dagger  Rudolf Magnus Institute for Neurosciences, Department of Medical Pharmacology, Unversiteitsweg 100, 3584 CG Utrecht, The Netherlands and the  Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037

The phosphorylation state of three identified neural-specific protein kinase C substrates (RC3, GAP-43/B-50, and MARCKS) was monitored in hippocampal slices of mice lacking the gamma -subtype of protein kinase C and wild-type controls by quantitative immunoprecipitation following 32Pi labeling. Depolarization with potassium, activation of glutamate receptors with glutamate, or direct stimulation of protein kinase C with a phorbol ester increased RC3 phosphorylation in wild-type animals but failed to affect RC3 phosphorylation in mice lacking the gamma -subtype of protein kinase C. Our results suggests the following biochemical pathway: activation of a postsynaptic (metabotropic) glutamate receptor stimulates the gamma -subtype of protein kinase C, which in turn phosphorylates RC3. The inability to increase RC3 phosphorylation in mice lacking the gamma -subtype of protein kinase C by membrane depolarization or glutamate receptor activation may contribute to the spatial learning deficits and impaired hippocampal LTP observed in these mice.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.



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