Crystal structure of G alpha 13 in complex with GDP

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 

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A new approach to producing functional G alpha subunits yields the activated and deactivated structures of G alpha(12/13) proteins.

Kreutz, B.Yau, D.M.Nance, M.R.Tanabe, S.Tesmer, J.J.Kozasa, T.

(2006) Biochemistry 45: 167-174

  • DOI: https://doi.org/10.1021/bi051729t
  • Primary Citation of Related Structures:  
    1ZCA, 1ZCB

  • PubMed Abstract: 

    The oncogenic G(12/13) subfamily of heterotrimeric G proteins transduces extracellular signals that regulate the actin cytoskeleton, cell cycle progression, and gene transcription. Previously, structural analyses of fully functional G alpha(12/13) subunits have been hindered by insufficient amounts of homogeneous, functional protein. Herein, we report that substitution of the N-terminal helix of G alpha(i1) for the corresponding region of G alpha12 or G alpha13 generated soluble chimeric subunits (G alpha(i/12) and G alpha(i/13)) that could be purified in sufficient amounts for crystallographic studies. Each chimera bound guanine nucleotides, G betagamma subunits, and effector proteins and exhibited GAP responses to p115RhoGEF and leukemia-associated RhoGEF. Like their wild-type counterparts, G alpha(i/13), but not G alpha(i/12), stimulated the activity of p115RhoGEF. Crystal structures of the G alpha(i/12) x GDP x AlF4(-) and G alpha(i/13) x GDP complexes were determined using diffraction data extending to 2.9 and 2.0 A, respectively. These structures reveal not only the native structural features of G alpha12 and G alpha13 subunits, which are expected to be important for their interactions with GPCRs and effectors such as G alpha-regulated RhoGEFs, but also novel conformational changes that are likely coupled to GTP hydrolysis in the G alpha(12/13) class of heterotrimeric G proteins.

  • Organizational Affiliation

    Department of Pharmacology, University of Illinois College of Medicine, Chicago, Illinois 60612, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
G alpha i/13362Mus musculusMutation(s): 0 
Gene Names: Gna13
UniProt & NIH Common Fund Data Resources
Find proteins for P27601 (Mus musculus)
Explore P27601 
Go to UniProtKB:  P27601
IMPC:  MGI:95768
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27601
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GDP

Download Ideal Coordinates CCD File 
C10 H15 N5 O11 P2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.209 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.391α = 90
b = 67.391β = 90
c = 175.159γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-15
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-08-16
    Changes: Source and taxonomy
  • Version 1.4: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description