Structure of the regulator of G-protein signaling domain of RGS6

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.196 

Starting Model: experimental
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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: https://doi.org/10.1073/pnas.0801508105
  • Primary Citation of Related Structures:  
    1ZV4, 2A72, 2AF0, 2BT2, 2BV1, 2ES0, 2GTP, 2I59, 2IHB, 2IHD, 2IK8, 2JM5, 2JNU, 2ODE, 2OWI

  • 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, 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
regulator of G-protein signalling 6148Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P49758 (Homo sapiens)
Explore P49758 
Go to UniProtKB:  P49758
PHAROS:  P49758
GTEx:  ENSG00000182732 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49758
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.196 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.567α = 90
b = 77.567β = 90
c = 73.02γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-29
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Derived calculations, Version format compliance
  • Version 1.3: 2018-01-31
    Changes: Structure summary
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Refinement description