1fqk: Difference between revisions
New page: left|200px<br /><applet load="1fqk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1fqk, resolution 2.30Å" /> '''CRYSTAL STRUCTURE OF... |
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[[Image:1fqk.jpg|left|200px]]<br /><applet load="1fqk" size=" | [[Image:1fqk.jpg|left|200px]]<br /><applet load="1fqk" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1fqk, resolution 2.30Å" /> | caption="1fqk, resolution 2.30Å" /> | ||
'''CRYSTAL STRUCTURE OF THE HETERODIMERIC COMPLEX OF THE RGS DOMAIN OF RGS9, AND THE GT/I1 CHIMERA ALPHA SUBUNIT [(RGS9)-(GT/I1ALPHA)-(GDP)-(ALF4-)-(MG2+)]'''<br /> | '''CRYSTAL STRUCTURE OF THE HETERODIMERIC COMPLEX OF THE RGS DOMAIN OF RGS9, AND THE GT/I1 CHIMERA ALPHA SUBUNIT [(RGS9)-(GT/I1ALPHA)-(GDP)-(ALF4-)-(MG2+)]'''<br /> | ||
==Overview== | ==Overview== | ||
A multitude of heptahelical receptors use heterotrimeric G proteins to | A multitude of heptahelical receptors use heterotrimeric G proteins to transduce signals to specific effector target molecules. The G protein transducin, Gt, couples photon-activated rhodopsin with the effector cyclic GMP phosophodiesterase (PDE) in the vertebrate phototransduction cascade. The interactions of the Gt alpha-subunit (alpha(t)) with the inhibitory PDE gamma-subunit (PDEgamma) are central to effector activation, and also enhance visual recovery in cooperation with the GTPase-activating protein regulator of G-protein signalling (RGS)-9 (refs 1-3). Here we describe the crystal structure at 2.0 A of rod transducin alpha x GDP x AlF4- in complex with the effector molecule PDEgamma and the GTPase-activating protein RGS9. In addition, we present the independently solved crystal structures of the RGS9 RGS domain both alone and in complex with alpha(t/i1) x GDP x AlF4-. These structures reveal insights into effector activation, synergistic GTPase acceleration, RGS9 specificity and RGS activity. Effector binding to a nucleotide-dependent site on alpha(t) sequesters PDEgamma residues implicated in PDE inhibition, and potentiates recruitment of RGS9 for hydrolytic transition state stabilization and concomitant signal termination. | ||
==About this Structure== | ==About this Structure== | ||
1FQK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bos_taurus_and_rattus_norvegicus Bos taurus and rattus norvegicus] and [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with MG, ALF and GDP as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | 1FQK is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Bos_taurus_and_rattus_norvegicus Bos taurus and rattus norvegicus] and [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus] with <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=ALF:'>ALF</scene> and <scene name='pdbligand=GDP:'>GDP</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FQK OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Bos taurus and rattus norvegicus]] | [[Category: Bos taurus and rattus norvegicus]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Cowan, C | [[Category: Cowan, C W.]] | ||
[[Category: He, W.]] | [[Category: He, W.]] | ||
[[Category: Kercher, M | [[Category: Kercher, M A.]] | ||
[[Category: Sigler, P | [[Category: Sigler, P B.]] | ||
[[Category: Slep, K | [[Category: Slep, K C.]] | ||
[[Category: Wensel, T | [[Category: Wensel, T G.]] | ||
[[Category: ALF]] | [[Category: ALF]] | ||
[[Category: GDP]] | [[Category: GDP]] | ||
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[[Category: transducin]] | [[Category: transducin]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:41:37 2008'' | ||
Revision as of 13:41, 21 February 2008
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CRYSTAL STRUCTURE OF THE HETERODIMERIC COMPLEX OF THE RGS DOMAIN OF RGS9, AND THE GT/I1 CHIMERA ALPHA SUBUNIT [(RGS9)-(GT/I1ALPHA)-(GDP)-(ALF4-)-(MG2+)]
OverviewOverview
A multitude of heptahelical receptors use heterotrimeric G proteins to transduce signals to specific effector target molecules. The G protein transducin, Gt, couples photon-activated rhodopsin with the effector cyclic GMP phosophodiesterase (PDE) in the vertebrate phototransduction cascade. The interactions of the Gt alpha-subunit (alpha(t)) with the inhibitory PDE gamma-subunit (PDEgamma) are central to effector activation, and also enhance visual recovery in cooperation with the GTPase-activating protein regulator of G-protein signalling (RGS)-9 (refs 1-3). Here we describe the crystal structure at 2.0 A of rod transducin alpha x GDP x AlF4- in complex with the effector molecule PDEgamma and the GTPase-activating protein RGS9. In addition, we present the independently solved crystal structures of the RGS9 RGS domain both alone and in complex with alpha(t/i1) x GDP x AlF4-. These structures reveal insights into effector activation, synergistic GTPase acceleration, RGS9 specificity and RGS activity. Effector binding to a nucleotide-dependent site on alpha(t) sequesters PDEgamma residues implicated in PDE inhibition, and potentiates recruitment of RGS9 for hydrolytic transition state stabilization and concomitant signal termination.
About this StructureAbout this Structure
1FQK is a Protein complex structure of sequences from Bos taurus and rattus norvegicus and Bos taurus with , and as ligands. Full crystallographic information is available from OCA.
ReferenceReference
Structural determinants for regulation of phosphodiesterase by a G protein at 2.0 A., Slep KC, Kercher MA, He W, Cowan CW, Wensel TG, Sigler PB, Nature. 2001 Feb 22;409(6823):1071-7. PMID:11234020
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