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A-kinase anchoring protein AKAP220 binds to glycogen synthase kinase-3beta (GSK-3beta ) and mediates protein kinase A-dependent inhibition of GSK-3beta.

Authors: Tanji, C  Yamamoto, H  Yorioka, N  Kohno, N  Kikuchi, K  Kikuchi, A 
Citation: Tanji C, etal., J Biol Chem. 2002 Oct 4;277(40):36955-61. Epub 2002 Jul 29.
Pubmed: (View Article at PubMed) PMID:12147701
DOI: Full-text: DOI:10.1074/jbc.M206210200

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-3beta binds to AKAP220, which is known to act as an A-kinase anchoring protein. GSK-3beta 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-3beta, PKA, and PP1 form a quaternary complex. It has been reported that PKA phosphorylates GSK-3beta, thereby decreasing its activity. When COS cells were treated with dibutyryl cyclic AMP to activate PKA, the activity of GSK-3beta bound to AKAP220 decreased more markedly than the total GSK-3beta activity. Calyculin A, a protein phosphatase inhibitor, also inhibited the activity of GSK-3beta bound to AKAP220 more strongly than the total GSK-3beta activity. These results suggest that PKA and PP1 regulate the activity of GSK-3beta efficiently by forming a complex with AKAP220.

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RGD Object Information
RGD ID: 8554429
Created: 2014-05-08
Species: All species
Last Modified: 2014-05-08
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.