2p0f

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{{STRUCTURE_2p0f| PDB=2p0f | SCENE= }}
{{STRUCTURE_2p0f| PDB=2p0f | SCENE= }}
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'''ArhGAP9 PH domain in complex with Ins(1,3,5)P3'''
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===ArhGAP9 PH domain in complex with Ins(1,3,5)P3===
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==Overview==
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Pleckstrin homology (PH) domains are phosphoinositide (PI)-binding modules that target proteins to membrane surfaces. Here we define a family of PH domain proteins, including Tiam1 and ArhGAP9, that demonstrates specificity for PI(4,5)P(2), as well as for PI(3,4,5)P(3) and PI(3,4)P(2), the products of PI 3-kinase. These PH domain family members utilize a non-canonical phosphoinositide binding pocket related to that employed by beta-spectrin. Crystal structures of the PH domain of ArhGAP9 in complex with the headgroups of Ins(1,3,4)P(3), Ins(1,4,5)P(3), and Ins(1,3,5)P(3) reveal how two adjacent phosphate positions in PI(3,4)P(2), PI(4,5)P(2), and PI(3,4,5)P(3) are accommodated through flipped conformations of the bound phospholipid. We validate the non-canonical site of phosphoinositide interaction by showing that binding pocket mutations, which disrupt phosphoinositide binding in vitro, also disrupt membrane localization of Tiam1 in cells. We posit that the diversity in PI interaction modes displayed by PH domains contributes to their versatility of use in biological systems.
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{{ABSTRACT_PUBMED_17339315}}
==About this Structure==
==About this Structure==
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[[Category: Pleckstrin homology domain]]
[[Category: Pleckstrin homology domain]]
[[Category: Protein-phosphoinositide complex]]
[[Category: Protein-phosphoinositide complex]]
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Revision as of 10:12, 28 July 2008

Image:2p0f.png

Template:STRUCTURE 2p0f

ArhGAP9 PH domain in complex with Ins(1,3,5)P3

Template:ABSTRACT PUBMED 17339315

About this Structure

2P0F is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Non-canonical interaction of phosphoinositides with pleckstrin homology domains of Tiam1 and ArhGAP9., Ceccarelli DF, Blasutig IM, Goudreault M, Li Z, Ruston J, Pawson T, Sicheri F, J Biol Chem. 2007 May 4;282(18):13864-74. Epub 2007 Mar 5. PMID:17339315

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