1rgp
From Proteopedia
(New page: 200px<br /> <applet load="1rgp" size="450" color="white" frame="true" align="right" spinBox="true" caption="1rgp, resolution 2.0Å" /> '''GTPASE-ACTIVATION DO...) |
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| - | [[Image:1rgp.gif|left|200px]]<br /> | + | [[Image:1rgp.gif|left|200px]]<br /><applet load="1rgp" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1rgp" size=" | + | |
caption="1rgp, resolution 2.0Å" /> | caption="1rgp, resolution 2.0Å" /> | ||
'''GTPASE-ACTIVATION DOMAIN FROM RHOGAP'''<br /> | '''GTPASE-ACTIVATION DOMAIN FROM RHOGAP'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Members of the Rho family of small G proteins transduce signals from | + | Members of the Rho family of small G proteins transduce signals from plasma-membrane receptors and control cell adhesion, motility and shape by actin cytoskeleton formation. They also activate other kinase cascades. Like all other GTPases, Rho proteins act as molecular switches, with an active GTP-bound form and an inactive GDP-bound form. The active conformation is promoted by guanine-nucleotide exchange factors, and the inactive state by GTPase-activating proteins (GAPs) which stimulate the intrinsic GTPase activity of small G proteins. Rho-specific GAP domains are found in a wide variety of large, multi-functional proteins. Here we report the crystal structure of an active 242-residue C-terminal fragment of human p50rhoGAP. The structure is an unusual arrangement of nine alpha-helices, the core of which includes a four-helix bundle. Residues conserved across the rhoGAP family are largely confined to one face of this bundle, which may be an interaction site for target G proteins. In particular, we propose that Arg 85 and Asn 194 are involved in binding G proteins and enhancing GTPase activity. |
==About this Structure== | ==About this Structure== | ||
| - | 1RGP is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http:// | + | 1RGP is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RGP OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Barrett, T.]] | [[Category: Barrett, T.]] | ||
| - | [[Category: Dodson, E | + | [[Category: Dodson, E J.]] |
[[Category: Dodson, G.]] | [[Category: Dodson, G.]] | ||
| - | [[Category: Eccleston, J | + | [[Category: Eccleston, J F.]] |
| - | [[Category: Gamblin, S | + | [[Category: Gamblin, S J.]] |
| - | [[Category: Ludbrook, S | + | [[Category: Ludbrook, S B.]] |
[[Category: Musacchio, A.]] | [[Category: Musacchio, A.]] | ||
[[Category: Nurmahomed, K.]] | [[Category: Nurmahomed, K.]] | ||
| - | [[Category: Smerdon, S | + | [[Category: Smerdon, S J.]] |
[[Category: Xiao, B.]] | [[Category: Xiao, B.]] | ||
[[Category: g-protein]] | [[Category: g-protein]] | ||
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[[Category: signal-transduction]] | [[Category: signal-transduction]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:50:41 2008'' |
Revision as of 12:50, 21 February 2008
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GTPASE-ACTIVATION DOMAIN FROM RHOGAP
Overview
Members of the Rho family of small G proteins transduce signals from plasma-membrane receptors and control cell adhesion, motility and shape by actin cytoskeleton formation. They also activate other kinase cascades. Like all other GTPases, Rho proteins act as molecular switches, with an active GTP-bound form and an inactive GDP-bound form. The active conformation is promoted by guanine-nucleotide exchange factors, and the inactive state by GTPase-activating proteins (GAPs) which stimulate the intrinsic GTPase activity of small G proteins. Rho-specific GAP domains are found in a wide variety of large, multi-functional proteins. Here we report the crystal structure of an active 242-residue C-terminal fragment of human p50rhoGAP. The structure is an unusual arrangement of nine alpha-helices, the core of which includes a four-helix bundle. Residues conserved across the rhoGAP family are largely confined to one face of this bundle, which may be an interaction site for target G proteins. In particular, we propose that Arg 85 and Asn 194 are involved in binding G proteins and enhancing GTPase activity.
About this Structure
1RGP is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
The structure of the GTPase-activating domain from p50rhoGAP., Barrett T, Xiao B, Dodson EJ, Dodson G, Ludbrook SB, Nurmahomed K, Gamblin SJ, Musacchio A, Smerdon SJ, Eccleston JF, Nature. 1997 Jan 30;385(6615):458-61. PMID:9009196
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