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Protein phosphatase 1 is involved in the dissociation of Ca2+/calmodulin-dependent protein kinase II from
Y Yoshimura1, Y Sogawa, T Yamauchi
1Department of Biochemistry, Faculty of Pharmaceutical Sciences, The University of Tokushima, Japan.
Abstract:
Autophosphorylation-dependent translocation of Ca2+/calmodulin-dependent protein kinase II (CaM kinase II) to postsynaptic densities (PSDs) from cytosol may be a physiologically important process during synaptic activation. We investigated a protein phosphatase responsible for dephosphorylation of the kinase. CaM kinase II was shown to be targeted to two sites using the gel overlay method in two-dimensional gel electrophoresis. Protein phosphatase 1 (PP1) was identified to dephosphorylate CaM kinase II from its complex with PSDs using phosphatase inhibitors and activators, and purified phosphatases. The kinase was released from PSDs after its dephosphorylation by PP1.