The alpha-isoform of glycogen synthase kinase-3 from rabbit skeletal muscle is inactivated by p70 S6 kinase or MAP kinase-activated protein kinase-1 in vitro - PubMed (original) (raw)
The alpha-isoform of glycogen synthase kinase-3 from rabbit skeletal muscle is inactivated by p70 S6 kinase or MAP kinase-activated protein kinase-1 in vitro
C Sutherland et al. FEBS Lett. 1994.
Free article
Abstract
The alpha-isoform of glycogen synthase kinase-3 (GSK3 alpha) was inactivated by 80% towards a synthetic peptide substrate upon incubation with Mg-ATP and either MAP kinase-activated protein (MAPKAP) kinase-1 or p70 S6 kinase. Inactivation by either kinase resulted from the phosphorylation of Ser-21 and was reversed by treatment with protein phosphatase 2A1. Phosphorylation also decreased GSK3 alpha activity towards glycogen synthase, inhibitor-2 and c-jun. The specificity of GSK3 alpha was similar to GSK3 beta, but with the synthetic peptide substrate heparin stimulated the dephosphorylated form of GSK3 alpha (6-fold) more than GSK3 beta (1.8-fold). After phosphorylation, both isoforms were stimulated 15-20-fold by heparin.
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