1gfi: Difference between revisions
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|PDB= 1gfi |SIZE=350|CAPTION= <scene name='initialview01'>1gfi</scene>, resolution 2.2Å | |PDB= 1gfi |SIZE=350|CAPTION= <scene name='initialview01'>1gfi</scene>, resolution 2.2Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=ALF:TETRAFLUOROALUMINATE+ION'>ALF</scene>, <scene name='pdbligand=GDP:GUANOSINE-5'-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1gfi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gfi OCA], [http://www.ebi.ac.uk/pdbsum/1gfi PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1gfi RCSB]</span> | |||
}} | }} | ||
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[[Category: Coleman, D E.]] | [[Category: Coleman, D E.]] | ||
[[Category: Sprang, S R.]] | [[Category: Sprang, S R.]] | ||
[[Category: signal transduction protein]] | [[Category: signal transduction protein]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:42:55 2008'' | ||
Revision as of 20:42, 30 March 2008
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| , resolution 2.2Å | |||||||
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| Ligands: | , , | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STRUCTURES OF ACTIVE CONFORMATIONS OF GI ALPHA 1 AND THE MECHANISM OF GTP HYDROLYSIS
OverviewOverview
Mechanisms of guanosine triphosphate (GTP) hydrolysis by members of the G protein alpha subunit-p21ras superfamily of guanosine triphosphatases have been studied extensively but have not been well understood. High-resolution x-ray structures of the GTP gamma S and GDP.AlF4- complexes formed by the G protein Gi alpha 1 demonstrate specific roles in transition-state stabilization for two highly conserved residues. Glutamine204 (Gln61 in p21ras) stabilizes and orients the hydrolytic water in the trigonal-bipyramidal transition state. Arginine 178 stabilizes the negative charge at the equatorial oxygen atoms of the pentacoordinate phosphate intermediate. Conserved only in the G alpha family, this residue may account for the higher hydrolytic rate of G alpha proteins relative to those of the p21ras family members. The fold of Gi alpha 1 differs from that of the homologous Gt alpha subunit in the conformation of a helix-loop sequence located in the alpha-helical domain that is characteristic of these proteins; this site may participate in effector binding. The amino-terminal 33 residues are disordered in GTP gamma S-Gi alpha 1, suggesting a mechanism that may promote release of the beta gamma subunit complex when the alpha subunit is activated by GTP.
About this StructureAbout this Structure
1GFI is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
ReferenceReference
Structures of active conformations of Gi alpha 1 and the mechanism of GTP hydrolysis., Coleman DE, Berghuis AM, Lee E, Linder ME, Gilman AG, Sprang SR, Science. 1994 Sep 2;265(5177):1405-12. PMID:8073283
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