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Phosphoprotein-protein interactions revealed by the crystal structure of kinase-associated phosphatase in complex with PhosphoCDK2

Lookup NU author(s): Professor Martin Noble

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Abstract

The CDK-interacting protein phosphatase KAP dephosphorylates phosphoThr-160 (pThr-160) of the CDK2 activation segment, the site of regulatory phosphorylation that is essential for kinase activity. Here we describe the crystal structure of KAP in association with pThr-160-CDK2, representing an example of a protein phosphatase in complex with its intact protein substrate. The major protein interface between the two molecules is formed by the C-terminal lobe of CDK2 and the C-terminal helix of KAP, regions remote from the kinase-activation segment and the KAP catalytic site. The kinase-activation segment interacts with the catalytic site of KAP almost entirely via the phosphate group of pThr-160. This interaction requires that the activation segment is unfolded and drawn away from the kinase molecule, inducing a conformation of CDK2 similar to the activated state observed in the CDK2/cyclin A complex.


Publication metadata

Author(s): Song HW, Hanlon N, Brown NR, Noble MEM, Johnson LN, Barford D

Publication type: Article

Publication status: Published

Journal: Molecular Cell

Year: 2001

Volume: 7

Issue: 3

Pages: 615-626

ISSN (print): 1097-2765

ISSN (electronic): 1097-4164

Publisher: Cell Press

URL: http://dx.doi.org/10.1016/S1097-2765(01)00208-8

DOI: 10.1016/S1097-2765(01)00208-8


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