4YON

P-Rex1:Rac1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

The Phosphatidylinositol (3,4,5)-Trisphosphate-dependent Rac Exchanger 1Ras-related C3 Botulinum Toxin Substrate 1 (P-Rex1Rac1) Complex Reveals the Basis of Rac1 Activation in Breast Cancer Cells.

Lucato, C.M.Halls, M.L.Ooms, L.M.Liu, H.J.Mitchell, C.A.Whisstock, J.C.Ellisdon, A.M.

(2015) J Biol Chem 290: 20827-20840

  • DOI: 10.1074/jbc.M115.660456
  • Primary Citation of Related Structures:  
    4YON

  • PubMed Abstract: 
  • The P-Rex (phosphatidylinositol (3,4,5)-trisphosphate (PIP3)-dependent Rac exchanger) family (P-Rex1 and P-Rex2) of the Rho guanine nucleotide exchange factors (Rho GEFs) activate Rac GTPases to regulate cell migration, invasion, and metastasis in several human cancers ...

    The P-Rex (phosphatidylinositol (3,4,5)-trisphosphate (PIP3)-dependent Rac exchanger) family (P-Rex1 and P-Rex2) of the Rho guanine nucleotide exchange factors (Rho GEFs) activate Rac GTPases to regulate cell migration, invasion, and metastasis in several human cancers. The family is unique among Rho GEFs, as their activity is regulated by the synergistic binding of PIP3 and Gβγ at the plasma membrane. However, the molecular mechanism of this family of multi-domain proteins remains unclear. We report the 1.95 Å crystal structure of the catalytic P-Rex1 DH-PH tandem domain in complex with its cognate GTPase, Rac1 (Ras-related C3 botulinum toxin substrate-1). Mutations in the P-Rex1·Rac1 interface revealed a critical role for this complex in signaling downstream of receptor tyrosine kinases and G protein-coupled receptors. The structural data indicated that the PIP3/Gβγ binding sites are on the opposite surface and markedly removed from the Rac1 interface, supporting a model whereby P-Rex1 binding to PIP3 and/or Gβγ releases inhibitory C-terminal domains to expose the Rac1 binding site.


    Organizational Affiliation

    From the Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia, the Australian Research Council Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria 3800, Australia, and andrew.ellisdon@monash.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphatidylinositol 3,4,5-trisphosphate-dependent Rac exchanger 1 proteinA405Homo sapiensMutation(s): 0 
Gene Names: PREX1KIAA1415
Find proteins for Q8TCU6 (Homo sapiens)
Explore Q8TCU6 
Go to UniProtKB:  Q8TCU6
NIH Common Fund Data Resources
PHAROS:  Q8TCU6
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1B179Homo sapiensMutation(s): 1 
Gene Names: RAC1TC25MIG5
EC: 3.6.5.2
Find proteins for P63000 (Homo sapiens)
Explore P63000 
Go to UniProtKB:  P63000
NIH Common Fund Data Resources
PHAROS:  P63000
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.163 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.51α = 90
b = 111.25β = 90
c = 158.12γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia--

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-01
    Type: Initial release
  • Version 1.1: 2015-07-15
    Changes: Database references
  • Version 1.2: 2015-09-02
    Changes: Database references, Other
  • Version 1.3: 2017-09-06
    Changes: Author supporting evidence, Data collection, Derived calculations, Structure summary
  • Version 1.4: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.5: 2020-02-26
    Changes: Data collection