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J. Biol. Chem., Vol. 277, Issue 40, 36955-36961, October 4, 2002
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(GSK-3
) and Mediates Protein Kinase
A-dependent Inhibition of GSK-3
*
§,
,
From the Departments of Glycogen synthase kinase-3 (GSK-3) is regulated
by various extracellular ligands and phosphorylates many substrates,
thereby regulating cellular functions. Using yeast two-hybrid
screening, we found that GSK-3
Biochemistry and
§ Molecular and Internal Medicine, Graduate School of
Biomedical Sciences, Hiroshima University, 1-2-3, Kasumi, Minami-ku,
Hiroshima 734-8551, Japan and the ¶ Division of Biochemical
Oncology and Immunology, Institute for Genetic Medicine, Hokkaido
University, Kita-15, Nichi-7, Kita-ku, Sapporo 060-0815, Japan
binds to AKAP220, which is known to
act as an A-kinase anchoring protein. GSK-3
formed a complex with
AKAP220 in intact cells at the endogenous level. Cyclic
AMP-dependent protein kinase (PKA) and type 1 protein
phosphatase (PP1) were also detected in this complex, suggesting that
AKAP220, GSK-3
, PKA, and PP1 form a quaternary complex. It has been
reported that PKA phosphorylates GSK-3
, thereby decreasing its
activity. When COS cells were treated with dibutyryl cyclic AMP to
activate PKA, the activity of GSK-3
bound to AKAP220 decreased more
markedly than the total GSK-3
activity. Calyculin A, a protein
phosphatase inhibitor, also inhibited the activity of GSK-3
bound to
AKAP220 more strongly than the total GSK-3
activity. These
results suggest that PKA and PP1 regulate the activity of GSK-3
efficiently by forming a complex with AKAP220.
To whom correspondence should be addressed: Dept. of
Biochemistry, Graduate School of Biomedical Sciences, Hiroshima
University, 1-2-3, Kasumi, Minami-ku, Hiroshima 734-8551, Japan. Tel.:
81-82-257-5130; Fax: 81-82-257-5134; E-mail:
akikuchi@hiroshima-u.ac.jp.
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