1r8q: Difference between revisions
New page: left|200px<br /> <applet load="1r8q" size="450" color="white" frame="true" align="right" spinBox="true" caption="1r8q, resolution 1.86Å" /> '''FULL-LENGTH ARF1-GD... |
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[[Image:1r8q. | [[Image:1r8q.jpg|left|200px]]<br /><applet load="1r8q" size="350" color="white" frame="true" align="right" spinBox="true" | ||
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caption="1r8q, resolution 1.86Å" /> | caption="1r8q, resolution 1.86Å" /> | ||
'''FULL-LENGTH ARF1-GDP-MG IN COMPLEX WITH BREFELDIN A AND A SEC7 DOMAIN'''<br /> | '''FULL-LENGTH ARF1-GDP-MG IN COMPLEX WITH BREFELDIN A AND A SEC7 DOMAIN'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
1R8Q is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with MG, ZN, G3D and AFB as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | 1R8Q is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=ZN:'>ZN</scene>, <scene name='pdbligand=G3D:'>G3D</scene> and <scene name='pdbligand=AFB:'>AFB</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1R8Q OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: protein transport/exchange factor]] | [[Category: protein transport/exchange factor]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 16:47:50 2008'' | ||
Revision as of 17:47, 15 February 2008
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FULL-LENGTH ARF1-GDP-MG IN COMPLEX WITH BREFELDIN A AND A SEC7 DOMAIN
OverviewOverview
Small GTP-binding (G) proteins are activated by GDP/GTP nucleotide, exchange stimulated by guanine nucleotide exchange factors (GEFs)., Nucleotide dissociation from small G protein-GEF complexes involves, transient GDP-bound intermediates whose structures have never been, described. In the case of Arf proteins, small G proteins that regulate, membrane traffic in eukaryotic cells, such intermediates can be trapped, either by the natural inhibitor brefeldin A or by charge reversal at the, catalytic glutamate of the Sec7 domain of their GEFs. Here we report the, crystal structures of these intermediates that show that membrane, recruitment of Arf and nucleotide dissociation are separate reactions, stimulated by Sec7. The reactions proceed through sequential rotations of, the Arf.GDP core towards the Sec7 catalytic site, and are blocked by, interfacial binding of brefeldin A and unproductive stabilization of GDP, by charge reversal. The structural characteristics of the reaction and its, modes of inhibition reveal unexplored ways in which to inhibit the, activation of small G proteins.
About this StructureAbout this Structure
1R8Q is a Protein complex structure of sequences from Bos taurus and Homo sapiens with , , and as ligands. Full crystallographic information is available from OCA.
ReferenceReference
Structural snapshots of the mechanism and inhibition of a guanine nucleotide exchange factor., Renault L, Guibert B, Cherfils J, Nature. 2003 Dec 4;426(6966):525-30. PMID:14654833
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