1uki

From Proteopedia

Revision as of 15:02, 15 February 2008

Structural basis for the selective inhibition of JNK1 by the scaffolding protein JIP1 and SP600125

Overview

The c-jun N-terminal kinase (JNK) signaling pathway is regulated by, JNK-interacting protein-1 (JIP1), which is a scaffolding protein, assembling the components of the JNK cascade. Overexpression of JIP1, deactivates the JNK pathway selectively by cytoplasmic retention of JNK, and thereby inhibits gene expression mediated by JNK, which occurs in the, nucleus. Here, we report the crystal structure of human JNK1 complexed, with pepJIP1, the peptide fragment of JIP1, revealing its selectivity for, JNK1 over other MAPKs and the allosteric inhibition mechanism. The van der, Waals contacts by the three residues (Pro157, Leu160, and Leu162) of, pepJIP1 and the hydrogen bonding between Glu329 of JNK1 and Arg156 of, pepJIP1 are critical for the selective binding. Binding of the peptide, also induces a hinge motion between the N- and C-terminal domains of JNK1, and distorts the ATP-binding cleft, reducing the affinity of the kinase, for ATP. In addition, we also determined the ternary complex structure of, pepJIP1-bound JNK1 complexed with SP600125, an ATP-competitive inhibitor, of JNK, providing the basis for the JNK specificity of the compound.

Disease

Known disease associated with this structure: Diabetes mellitus, noninsulin-dependent OMIM:[604641]

About this Structure

1UKI is a Protein complex structure of sequences from Homo sapiens with as ligand. Active as Non-specific serine/threonine protein kinase, with EC number 2.7.11.1 Full crystallographic information is available from OCA.

Reference

Structural basis for the selective inhibition of JNK1 by the scaffolding protein JIP1 and SP600125., Heo YS, Kim SK, Seo CI, Kim YK, Sung BJ, Lee HS, Lee JI, Park SY, Kim JH, Hwang KY, Hyun YL, Jeon YH, Ro S, Cho JM, Lee TG, Yang CH, EMBO J. 2004 Jun 2;23(11):2185-95. Epub 2004 May 13. PMID:15141161

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