Neuron-specific protein F1 GAP-43 shows substrate specificity for the beta subtype of protein kinase C

Fwu Shan Sheu*, Richard M. Marais, Peter J. Parker, Nicolas G. Bazan, Aryeh Routtenberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

We determined whether the beta or gamma protein kinase C (PKC) subtypes implicated in long-term potentiation (LTP) selectively regulates protein F1 phosphorylation. Purified bovine PKC subtypes and recombinant PKC subtypes activated by phosphatidylserine (PS) and calcium were tested for their relative ability to phosphorylate purified rat protein F1 (a.k.a. GAP-43). After equalizing enzyme activity against histone, the recombinant betaII PKC phosphorylated protein F1 to a 6 fold greater extent than the recombinant gamma PKC. Bovine betaI PKC phosphorylated protein F1 to a 3 fold greater extent than bovine gamma PKC. Even when PS was replaced by lipoxin B4, which can selectively increase gamma PKC activity, betaI PKC was still superior to gamma PKC in phosphorylating protein F1. Taken together with previous cellular studies of brain showing parallel levels of expression of beta PKC mRNA and protein F1 mRNA, the present results make it attractive to propose that beta PKC regulates protein F1 phosphorylation during the development of synaptic plasticity.

Original languageEnglish (US)
Pages (from-to)1236-1243
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume171
Issue number3
DOIs
StatePublished - Sep 28 1990

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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