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 

wwPDB Validation   3D Report Full Report


This is version 1.1 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: 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 ...

    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
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(q) subunit alphaA, C347Mus musculusMutation(s): 6 
Gene Names: Gnaq
EC: 3.6.5.1
Find proteins for P21279 (Mus musculus)
Explore P21279 
Go to UniProtKB:  P21279
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Regulator of G-protein signaling 2B, D137Homo sapiensMutation(s): 0 
Gene Names: RGS2, G0S8, GIG31
Find proteins for P41220 (Homo sapiens)
Explore P41220 
Go to UniProtKB:  P41220
NIH Common Fund Data Resources
PHAROS:  P41220
GTEx:  ENSG00000116741
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 
 E [auth A], H [auth C]GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N		 Ligand Interaction
ALF
Query on ALF
Download Ideal Coordinates CCD File 
 F [auth A], I [auth C]TETRAFLUOROALUMINATE ION
Al F4
UYOMQIYKOOHAMK-UHFFFAOYSA-J		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
 G [auth A], J [auth C]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
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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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