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1eaz

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{{STRUCTURE_1eaz| PDB=1eaz | SCENE= }}
{{STRUCTURE_1eaz| PDB=1eaz | SCENE= }}
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'''CRYSTAL STRUCTURE OF THE PHOSPHOINOSITOL (3,4)-BISPHOSPHATE BINDING PH DOMAIN OF TAPP1 FROM HUMAN.'''
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===CRYSTAL STRUCTURE OF THE PHOSPHOINOSITOL (3,4)-BISPHOSPHATE BINDING PH DOMAIN OF TAPP1 FROM HUMAN.===
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==Overview==
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Phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P(3)] and its immediate breakdown product PtdIns(3,4)P(2) function as second messengers in growth factor- and insulin-induced signalling pathways. One of the ways that these 3-phosphoinositides are known to regulate downstream signalling events is by attracting proteins that possess specific PtdIns-binding pleckstrin homology (PH) domains to the plasma membrane. Many of these proteins, such as protein kinase B, phosphoinositide-dependent kinase 1 and the dual adaptor for phosphotyrosine and 3-phosphoinositides (DAPP1) interact with both PtdIns(3,4,5)P(3) and PtdIns(3,4)P(2) with similar affinity. Recently, a new PH-domain-containing protein, termed tandem PH-domain-containing protein (TAPP) 1, was described which is the first protein reported to bind PtdIns(3,4)P(2) specifically. Here we describe the crystal structure of the PtdIns(3,4)P(2)-binding PH domain of TAPP1 at 1.4 A (1 A=0.1 nm) resolution in complex with an ordered citrate molecule. The structure is similar to the known structure of the PH domain of DAPP1 around the D-3 and D-4 inositol-phosphate-binding sites. However, a glycine residue adjacent to the D-5 inositol-phosphate-binding site in DAPP1 is substituted for a larger alanine residue in TAPP1, which also induces a conformational change in the neighbouring residues. We show that mutation of this glycine to alanine in DAPP1 converts DAPP1 into a TAPP1-like PH domain that only interacts with PtdIns(3,4)P(2), whereas the alanine to glycine mutation in TAPP1 permits the TAPP1 PH domain to interact with PtdIns(3,4,5)P(3).
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(as it appears on PubMed at http://www.pubmed.gov), where 11513726 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11513726}}
==About this Structure==
==About this Structure==
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[[Category: Ph domain]]
[[Category: Ph domain]]
[[Category: Signalling]]
[[Category: Signalling]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 00:25:54 2008''

Revision as of 21:25, 30 June 2008

Image:1eaz.png

Template:STRUCTURE 1eaz

CRYSTAL STRUCTURE OF THE PHOSPHOINOSITOL (3,4)-BISPHOSPHATE BINDING PH DOMAIN OF TAPP1 FROM HUMAN.

Template:ABSTRACT PUBMED 11513726

About this Structure

1EAZ is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of the phosphatidylinositol 3,4-bisphosphate-binding pleckstrin homology (PH) domain of tandem PH-domain-containing protein 1 (TAPP1): molecular basis of lipid specificity., Thomas CC, Dowler S, Deak M, Alessi DR, van Aalten DM, Biochem J. 2001 Sep 1;358(Pt 2):287-94. PMID:11513726

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