2g83

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{{STRUCTURE_2g83| PDB=2g83 | SCENE= }}
{{STRUCTURE_2g83| PDB=2g83 | SCENE= }}
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'''Structure of activated G-alpha-i1 bound to a nucleotide-state-selective peptide: Minimal determinants for recognizing the active form of a G protein alpha subunit'''
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===Structure of activated G-alpha-i1 bound to a nucleotide-state-selective peptide: Minimal determinants for recognizing the active form of a G protein alpha subunit===
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==Overview==
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G-proteins cycle between an inactive GDP-bound state and an active GTP-bound state, serving as molecular switches that coordinate cellular signaling. We recently used phage display to identify a series of peptides that bind G alpha subunits in a nucleotide-dependent manner [Johnston, C. A., Willard, F. S., Jezyk, M. R., Fredericks, Z., Bodor, E. T., Jones, M. B., Blaesius, R., Watts, V. J., Harden, T. K., Sondek, J., Ramer, J. K., and Siderovski, D. P. (2005) Structure 13, 1069-1080]. Here we describe the structural features and functions of KB-1753, a peptide that binds selectively to GDP x AlF4(-)- and GTPgammaS-bound states of G alpha(i) subunits. KB-1753 blocks interaction of G alpha(transducin) with its effector, cGMP phosphodiesterase, and inhibits transducin-mediated activation of cGMP degradation. Additionally, KB-1753 interferes with RGS protein binding and resultant GAP activity. A fluorescent KB-1753 variant was found to act as a sensor for activated G alpha in vitro. The crystal structure of KB-1753 bound to G alpha(i1) x GDP x AlF4(-) reveals binding to a conserved hydrophobic groove between switch II and alpha3 helices and, along with supporting biochemical data and previous structural analyses, supports the notion that this is the site of effector interactions for G alpha(i) subunits.
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{{ABSTRACT_PUBMED_16981699}}
==About this Structure==
==About this Structure==
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[[Category: Guanine-nucleotide binding protein]]
[[Category: Guanine-nucleotide binding protein]]
[[Category: Phage display peptide]]
[[Category: Phage display peptide]]
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Revision as of 06:10, 28 July 2008

Image:2g83.png

Template:STRUCTURE 2g83

Structure of activated G-alpha-i1 bound to a nucleotide-state-selective peptide: Minimal determinants for recognizing the active form of a G protein alpha subunit

Template:ABSTRACT PUBMED 16981699

About this Structure

2G83 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Minimal determinants for binding activated G alpha from the structure of a G alpha(i1)-peptide dimer., Johnston CA, Lobanova ES, Shavkunov AS, Low J, Ramer JK, Blaesius R, Fredericks Z, Willard FS, Kuhlman B, Arshavsky VY, Siderovski DP, Biochemistry. 2006 Sep 26;45(38):11390-400. PMID:16981699

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