Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 

Starting Model: experimental
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Crystal structures of the small G protein Rap2A in complex with its substrate GTP, with GDP and with GTPgammaS.

Cherfils, J.Menetrey, J.Le Bras, G.Janoueix-Lerosey, I.de Gunzburg, J.Garel, J.R.Auzat, I.

(1997) EMBO J 16: 5582-5591

  • DOI: https://doi.org/10.1093/emboj/16.18.5582
  • Primary Citation of Related Structures:  
    1KAO, 2RAP

  • PubMed Abstract: 

    The small G protein Rap2A has been crystallized in complex with GDP, GTP and GTPgammaS. The Rap2A-GTP complex is the first structure of a small G protein with its natural ligand GTP. It shows that the hydroxyl group of Tyr32 forms a hydrogen bond with the gamma-phosphate of GTP and with Gly13. This interaction does not exist in the Rap2A-GTPgammaS complex. Tyr32 is conserved in many small G proteins, which probably also form this hydrogen bond with GTP. In addition, Tyr32 is structurally equivalent to a conserved arginine that binds GTP in trimeric G proteins. The actual participation of Tyr32 in GTP hydrolysis is not yet clear, but several possible roles are discussed. The conformational changes between the GDP and GTP complexes are located essentially in the switch I and II regions as described for the related oncoprotein H-Ras. However, the mobile segments vary in length and in the amplitude of movement. This suggests that even though similar regions might be involved in the GDP-GTP cycle of small G proteins, the details of the changes will be different for each G protein and will ensure the specificity of its interaction with a given set of cellular proteins.

  • Organizational Affiliation

    Laboratoire d'Enzymologie et de Biochimie Structurales, UPR 9063-CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RAP2A167Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P10114 (Homo sapiens)
Explore P10114 
Go to UniProtKB:  P10114
GTEx:  ENSG00000125249 
Entity Groups  
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UniProt GroupP10114
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Work: 0.186 
  • R-Value Observed: 0.186 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.826α = 90
b = 35.315β = 106.67
c = 58.356γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata 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: 1997-12-24
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-07
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.4: 2024-04-03
    Changes: Refinement description