1w1h

From Proteopedia

Revision as of 14:16, 30 October 2007

CRYSTAL STRUCTURE OF THE PDK1 PLECKSTRIN HOMOLOGY (PH) DOMAIN

Overview

3-phosphoinositide-dependent protein kinase-1 (PDK1) phosphorylates and, activates many kinases belonging to the AGC subfamily. PDK1 possesses a, C-terminal pleckstrin homology (PH) domain that interacts with, PtdIns(3,4,5)P3/PtdIns(3,4)P2 and with lower affinity to PtdIns(4,5)P2. We, describe the crystal structure of the PDK1 PH domain, in the absence and, presence of PtdIns(3,4,5)P3 and Ins(1,3,4,5)P4. The structures reveal a, 'budded' PH domain fold, possessing an N-terminal extension forming an, integral part of the overall fold, and display an unusually spacious, ligand-binding site. Mutagenesis and lipid-binding studies were used to, define the contribution of residues involved in phosphoinositide binding., Using a novel quantitative binding assay, we found that Ins(1,3,4,5,6)P5, ... [(full description)]

About this Structure

1W1H is a [Single protein] structure of sequence from [Homo sapiens] with SO4 and GOL as [ligands]. Active as [Transferred entry: 2.7.11.1], with EC number [2.7.1.37]. Structure known Active Site: AC1. Full crystallographic information is available from [OCA].

Reference

Structural insights into the regulation of PDK1 by phosphoinositides and inositol phosphates., Komander D, Fairservice A, Deak M, Kular GS, Prescott AR, Peter Downes C, Safrany ST, Alessi DR, van Aalten DM, EMBO J. 2004 Oct 13;23(20):3918-28. Epub 2004 Sep 30. PMID:15457207

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