1RYH

Alternative Splicing of Rac1 Generates Rac1b, a Self-activating GTPase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Alternative Splicing of Rac1 Generates Rac1b, a Self-activating GTPase

Fiegen, D.Haeusler, L.C.Blumenstein, L.Herbrand, U.Dvorsky, R.Vetter, I.R.Ahmadian, M.R.

(2004) J Biol Chem 279: 4743-4749

  • DOI: https://doi.org/10.1074/jbc.M310281200
  • Primary Citation of Related Structures:  
    1RYF, 1RYH

  • PubMed Abstract: 

    Rac1b was recently identified in malignant colorectal tumors as an alternative splice variant of Rac1 containing a 19-amino acid insertion next to the switch II region. The structures of Rac1b in the GDP- and the GppNHp-bound forms, determined at a resolution of 1.75 A, reveal that the insertion induces an open switch I conformation and a highly mobile switch II. As a consequence, Rac1b has an accelerated GEF-independent GDP/GTP exchange and an impaired GTP hydrolysis, which is restored partially by GTPase-activating proteins. Interestingly, Rac1b is able to bind the GTPase-binding domain of PAK but not full-length PAK in a GTP-dependent manner, suggesting that the insertion does not completely abolish effector interaction. The presented study provides insights into the structural and biochemical mechanism of a self-activating GTPase.


  • Organizational Affiliation

    Max-Planck-Institut für molekulare Physiologie, Abteilung Strukturelle Biologie, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ras-related C3 botulinum toxin substrate 1 isoform Rac1b
A, B
203Homo sapiensMutation(s): 0 
EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P63000 (Homo sapiens)
Explore P63000 
Go to UniProtKB:  P63000
PHAROS:  P63000
GTEx:  ENSG00000136238 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63000
Sequence Annotations
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
GNP PDBBind:  1RYH Kd: 27.6 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.55α = 90
b = 78.67β = 90
c = 96.88γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata 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: 2004-01-27
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description