2rap

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{{STRUCTURE_2rap| PDB=2rap | SCENE= }}
{{STRUCTURE_2rap| PDB=2rap | SCENE= }}
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'''THE SMALL G PROTEIN RAP2A IN COMPLEX WITH GTP'''
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===THE SMALL G PROTEIN RAP2A IN COMPLEX WITH GTP===
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==Overview==
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The small G protein Rap2A has been crystallized in complex with GDP, GTP and GTPgammaS. The Rap2A-GTP complex is the first structure of a small G protein with its natural ligand GTP. It shows that the hydroxyl group of Tyr32 forms a hydrogen bond with the gamma-phosphate of GTP and with Gly13. This interaction does not exist in the Rap2A-GTPgammaS complex. Tyr32 is conserved in many small G proteins, which probably also form this hydrogen bond with GTP. In addition, Tyr32 is structurally equivalent to a conserved arginine that binds GTP in trimeric G proteins. The actual participation of Tyr32 in GTP hydrolysis is not yet clear, but several possible roles are discussed. The conformational changes between the GDP and GTP complexes are located essentially in the switch I and II regions as described for the related oncoprotein H-Ras. However, the mobile segments vary in length and in the amplitude of movement. This suggests that even though similar regions might be involved in the GDP-GTP cycle of small G proteins, the details of the changes will be different for each G protein and will ensure the specificity of its interaction with a given set of cellular proteins.
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(as it appears on PubMed at http://www.pubmed.gov), where 9312017 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9312017}}
==About this Structure==
==About this Structure==
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[[Category: Rap2a]]
[[Category: Rap2a]]
[[Category: Ra]]
[[Category: Ra]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 14:10:25 2008''

Revision as of 11:10, 28 July 2008

Image:2rap.png

Template:STRUCTURE 2rap

THE SMALL G PROTEIN RAP2A IN COMPLEX WITH GTP

Template:ABSTRACT PUBMED 9312017

About this Structure

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

Reference

Crystal structures of the small G protein Rap2A in complex with its substrate GTP, with GDP and with GTPgammaS., Cherfils J, Menetrey J, Le Bras G, Janoueix-Lerosey I, de Gunzburg J, Garel JR, Auzat I, EMBO J. 1997 Sep 15;16(18):5582-91. PMID:9312017

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