3SUA

Crystal structure of the intracellular domain of Plexin-B1 in complex with Rac1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.39 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

A Dual Binding Mode for RhoGTPases in Plexin Signalling.

Bell, C.H.Aricescu, A.R.Jones, E.Y.Siebold, C.

(2011) PLoS Biol 9: e1001134-e1001134

  • DOI: https://doi.org/10.1371/journal.pbio.1001134
  • Primary Citation of Related Structures:  
    3SU8, 3SUA

  • PubMed Abstract: 

    Plexins are cell surface receptors for the semaphorin family of cell guidance cues. The cytoplasmic region comprises a Ras GTPase-activating protein (GAP) domain and a RhoGTPase binding domain. Concomitant binding of extracellular semaphorin and intracellular RhoGTPase triggers GAP activity and signal transduction. The mechanism of this intricate regulation remains elusive. We present two crystal structures of the human Plexin-B1 cytoplasmic region in complex with a constitutively active RhoGTPase, Rac1. The structure of truncated Plexin-B1-Rac1 complex provides no mechanism for coupling RhoGTPase and Ras binding sites. On inclusion of the juxtamembrane helix, a trimeric structure of Plexin-B1-Rac1 complexes is stabilised by a second, novel, RhoGTPase binding site adjacent to the Ras site. Site-directed mutagenesis combined with cellular and biophysical assays demonstrate that this new binding site is essential for signalling. Our findings are consistent with a model in which extracellular and intracellular plexin clustering events combine into a single signalling output.


  • Organizational Affiliation

    Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1
A, B, C
184Homo sapiensMutation(s): 0 
Gene Names: RAC1TC25MIG5
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
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Plexin-B1
D, E, F
633Homo sapiensMutation(s): 0 
Gene Names: PLXNB1KIAA0407PLXN5SEP
UniProt & NIH Common Fund Data Resources
Find proteins for O43157 (Homo sapiens)
Explore O43157 
Go to UniProtKB:  O43157
PHAROS:  O43157
GTEx:  ENSG00000164050 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43157
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.39 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.34α = 90
b = 224.25β = 90
c = 258.16γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-09-07
    Type: Initial release
  • Version 1.1: 2011-10-05
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations