1KJY

Crystal Structure of Human G[alpha]i1 Bound to the GoLoco Motif of RGS14

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Structural determinants for GoLoco-induced inhibition of nucleotide release by Galpha subunits.

Kimple, R.J., Kimple, M.E., Betts, L., Sondek, J., Siderovski, D.P.

(2002) Nature 416: 878-881

  • DOI: 10.1038/416878a
  • Primary Citation of Related Structures:  
    1KJY

  • PubMed Abstract: 

    • Heterotrimeric G-proteins bind to cell-surface receptors and are integral in transmission of signals from outside the cell. Upon activation of the Galpha subunit by binding of GTP, the Galpha and Gbetagamma subunits dissociate and interact with effector proteins for signal transduction ...

    Heterotrimeric G-proteins bind to cell-surface receptors and are integral in transmission of signals from outside the cell. Upon activation of the Galpha subunit by binding of GTP, the Galpha and Gbetagamma subunits dissociate and interact with effector proteins for signal transduction. Regulatory proteins with the 19-amino-acid GoLoco motif can bind to Galpha subunits and maintain G-protein subunit dissociation in the absence of Galpha activation. Here we describe the structural determinants of GoLoco activity as revealed by the crystal structure of Galpha(i1) GDP bound to the GoLoco region of the 'regulator of G-protein signalling' protein RGS14. Key contacts are described between the GoLoco motif and Galpha protein, including the extension of GoLoco's highly conserved Asp/Glu-Gln-Arg triad into the nucleotide-binding pocket of Galpha to make direct contact with the GDP alpha- and beta-phosphates. The structural organization of the GoLoco Galpha(i1) complex, when combined with supporting data from domain-swapping experiments, suggests that the Galpha all-helical domain and GoLoco-region carboxy-terminal residues control the specificity of GoLoco Galpha interactions.

    Organizational Affiliation: 

    Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GUANINE NUCLEOTIDE-BINDING PROTEIN G(I), ALPHA-1 SUBUNITA, C325Homo sapiensMutation(s): 0 
Gene Names: GNAI1
UniProt & NIH Common Fund Data Resources
Find proteins for P63096 (Homo sapiens)
Explore P63096 
Go to UniProtKB:  P63096
PHAROS:  P63096
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63096
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
REGULATOR OF G-PROTEIN SIGNALING 14B, D36N/AMutation(s): 0 
UniProt
Find proteins for O08773 (Rattus norvegicus)
Explore O08773 
Go to UniProtKB:  O08773
Entity Groups  
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UniProt GroupO08773
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP
Download Ideal Coordinates CCD File 
L [auth A],
V [auth C]		GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N		 Ligand Interaction
CS
Query on CS
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E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
O [auth C],
P [auth C],
Q [auth C],
R [auth C],
S [auth C],
T [auth C],
U [auth C],
W [auth D]
CESIUM ION
Cs
NCMHKCKGHRPLCM-UHFFFAOYSA-N		 Ligand Interaction
MG
Query on MG
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M [auth B],
N [auth C]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 
  • Space Group: P 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.51α = 90
b = 82.04β = 90
c = 187.24γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-05-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model