4EKC

Structure of human regulator of G protein signaling 2 (RGS2) in complex with murine Galpha-q(R183C)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.40 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.161 

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This is version 1.2 of the entry. See complete history


Literature

Structural and functional analysis of the regulator of G protein signaling 2-g alpha q complex.

Nance, M.R.Kreutz, B.Tesmer, V.M.Sterne-Marr, R.Kozasa, T.Tesmer, J.J.

(2013) Structure 21: 438-448

  • DOI: https://doi.org/10.1016/j.str.2012.12.016
  • Primary Citation of Related Structures:  
    4EKC, 4EKD

  • PubMed Abstract: 

    The heterotrimeric G protein Gαq is a key regulator of blood pressure, and excess Gαq signaling leads to hypertension. A specific inhibitor of Gαq is the GTPase activating protein (GAP) known as regulator of G protein signaling 2 (RGS2). The molecular basis for how Gαq/11 subunits serve as substrates for RGS proteins and how RGS2 mandates its selectivity for Gαq is poorly understood. In crystal structures of the RGS2-Gαq complex, RGS2 docks to Gαq in a different orientation from that observed in RGS-Gαi/o complexes. Despite its unique pose, RGS2 maintains canonical interactions with the switch regions of Gαq in part because its α6 helix adopts a distinct conformation. We show that RGS2 forms extensive interactions with the α-helical domain of Gαq that contribute to binding affinity and GAP potency. RGS subfamilies that do not serve as GAPs for Gαq are unlikely to form analogous stabilizing interactions.


  • Organizational Affiliation

    Life Sciences Institute, University of Michigan, Ann Arbor, MI 48109-2216, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(q) subunit alpha
A, C
347Mus musculusMutation(s): 6 
Gene Names: Gnaq
EC: 3.6.5.1
UniProt
Find proteins for P21279 (Mus musculus)
Explore P21279 
Go to UniProtKB:  P21279
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21279
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Regulator of G-protein signaling 2
B, D
137Homo sapiensMutation(s): 0 
Gene Names: RGS2G0S8GIG31
UniProt & NIH Common Fund Data Resources
Find proteins for P41220 (Homo sapiens)
Explore P41220 
Go to UniProtKB:  P41220
GTEx:  ENSG00000116741 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP41220
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.40 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.161 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.603α = 90
b = 124.983β = 124.13
c = 97.196γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-01-30
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description