Wild type human Rac1-GDP

Experimental Data Snapshot

  • Resolution: 2.59 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.196 

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This is version 1.4 of the entry. See complete history


Allosteric inhibition of the guanine nucleotide exchange factor DOCK5 by a small molecule.

Ferrandez, Y.Zhang, W.Peurois, F.Akendengue, L.Blangy, A.Zeghouf, M.Cherfils, J.

(2017) Sci Rep 7: 14409-14409

  • DOI: https://doi.org/10.1038/s41598-017-13619-2
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Rac small GTPases and their GEFs of the DOCK family are pivotal checkpoints in development, autoimmunity and bone homeostasis, and their abnormal regulation is associated to diverse pathologies. Small molecules that inhibit their activities are therefore needed to investigate their functions. Here, we characterized the mechanism of inhibition of human DOCK5 by C21, a small molecule that inhibits mouse Dock5 in cells and blocks bone degradation in mice models of osteoporosis. We showed that the catalytic DHR2 domain of DOCK5 has a high basal GEF activity in the absence of membranes which is not regulated by a simple feedback loop. C21 blocks this activity in a non-competitive manner and is specific for DOCK5. In contrast, another Dock inhibitor, CPYPP, inhibits both DOCK5 and an unrelated GEF, Trio. To gain insight into structural features of the inhibitory mechanism of C21, we used SAXS analysis of DOCK5 DHR2 and crystallographic analysis of unbound Rac1-GDP. Together, these data suggest that C21 takes advantage of intramolecular dynamics of DOCK5 and Rac1 to remodel the complex into an unproductive conformation. Based on this allosteric mechanism, we propose that diversion of intramolecular dynamics is a potent mechanism for the inhibition of multidomain regulators of small GTPases.

  • Organizational Affiliation

    Laboratoire de Biologie et Pharmacologie Appliquée, CNRS and Ecole Normale Supérieure Paris-Saclay, Cachan, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1
A, B
176Homo sapiensMutation(s): 0 
Gene Names: RAC1TC25MIG5
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.59 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.641α = 90
b = 82.656β = 90
c = 105.898γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Labex lermitFrance--

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-27
    Type: Initial release
  • Version 1.1: 2018-01-24
    Changes: Structure summary
  • Version 1.2: 2019-10-16
    Changes: Data collection
  • Version 1.3: 2020-11-18
    Changes: Derived calculations, Structure summary
  • Version 1.4: 2024-05-08
    Changes: Advisory, Data collection, Database references