2IK8

Crystal structure of the heterodimeric complex of human RGS16 and activated Gi alpha 1

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural diversity in the RGS domain and its interaction with heterotrimeric G protein alpha-subunits.

Soundararajan, M., Willard, F.S., Kimple, A.J., Turnbull, A.P., Ball, L.J., Schoch, G.A., Gileadi, C., Fedorov, O.Y., Dowler, E.F., Higman, V.A., Hutsell, S.Q., Sundstrom, M., Doyle, D.A., Siderovski, D.P.

(2008) Proc Natl Acad Sci U S A 105: 6457-6462

  • DOI: 10.1073/pnas.0801508105
  • Primary Citation of Related Structures:  
    2AF0, 1ZV4, 2A72, 2I59, 2IHD, 2IHB, 2IK8, 2OWI, 2ODE, 2JM5

  • PubMed Abstract: 

    • Regulator of G protein signaling (RGS) proteins accelerate GTP hydrolysis by Galpha subunits and thus facilitate termination of signaling initiated by G protein-coupled receptors (GPCRs). RGS proteins hold great promise as disease intervention points, gi ...

    Regulator of G protein signaling (RGS) proteins accelerate GTP hydrolysis by Galpha subunits and thus facilitate termination of signaling initiated by G protein-coupled receptors (GPCRs). RGS proteins hold great promise as disease intervention points, given their signature role as negative regulators of GPCRs-receptors to which the largest fraction of approved medications are currently directed. RGS proteins share a hallmark RGS domain that interacts most avidly with Galpha when in its transition state for GTP hydrolysis; by binding and stabilizing switch regions I and II of Galpha, RGS domain binding consequently accelerates Galpha-mediated GTP hydrolysis. The human genome encodes more than three dozen RGS domain-containing proteins with varied Galpha substrate specificities. To facilitate their exploitation as drug-discovery targets, we have taken a systematic structural biology approach toward cataloging the structural diversity present among RGS domains and identifying molecular determinants of their differential Galpha selectivities. Here, we determined 14 structures derived from NMR and x-ray crystallography of members of the R4, R7, R12, and RZ subfamilies of RGS proteins, including 10 uncomplexed RGS domains and 4 RGS domain/Galpha complexes. Heterogeneity observed in the structural architecture of the RGS domain, as well as in engagement of switch III and the all-helical domain of the Galpha substrate, suggests that unique structural determinants specific to particular RGS protein/Galpha pairings exist and could be used to achieve selective inhibition by small molecules.

    Organizational Affiliation: 

    Structural Genomics Consortium, Oxford University, Oxford OX3 7DQ, United Kingdom.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i), alpha-1 subunit A, C324Homo sapiensMutation(s): 0 
Gene Names: GNAI1
Find proteins for P63096 (Homo sapiens)
Explore P63096 
Go to UniProtKB:  P63096
NIH Common Fund Data Resources
PHAROS:  P63096
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Regulator of G-protein signaling 16 B, D140Homo sapiensMutation(s): 0 
Gene Names: RGS16, RGSR
Find proteins for O15492 (Homo sapiens)
Explore O15492 
Go to UniProtKB:  O15492
NIH Common Fund Data Resources
PHAROS:  O15492
GTEx:  ENSG00000143333
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.656α = 90
b = 104.312β = 90
c = 124.048γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance