1fpz
CRYSTAL STRUCTURE ANALYSIS OF KINASE ASSOCIATED PHOSPHATASE (KAP) WITH A SUBSTITUTION OF THE CATALYTIC SITE CYSTEINE (CYS140) TO A SERINE
OverviewOverview
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.
About this StructureAbout this Structure
1FPZ is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Phosphoprotein-protein interactions revealed by the crystal structure of kinase-associated phosphatase in complex with phosphoCDK2., Song H, Hanlon N, Brown NR, Noble ME, Johnson LN, Barford D, Mol Cell. 2001 Mar;7(3):615-26. PMID:11463386 Page seeded by OCA on Fri May 2 16:37:40 2008