6PXC

N-Terminal SH2 domain of the p120RasGAP bound to a p190RhoGAP phosphotyrosine peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of p120RasGAP N-terminal SH2 domain in its apo form and in complex with a p190RhoGAP phosphotyrosine peptide.

Jaber Chehayeb, R.Stiegler, A.L.Boggon, T.J.

(2019) PLoS One 14: e0226113-e0226113

  • DOI: 10.1371/journal.pone.0226113
  • Primary Citation of Related Structures:  
    6PXB, 6PXC

  • PubMed Abstract: 
  • The Rho and Ras pathways play vital roles in cell growth, division and motility. Cross-talk between the pathways amplifies their roles in cell proliferation and motility and its dysregulation is involved in disease pathogenesis. One important interaction for cross-talk occurs between p120RasGAP (RASA1), a GTPase activating protein (GAP) for Ras, and p190RhoGAP (p190RhoGAP-A, ARHGAP35), a GAP for Rho ...

    The Rho and Ras pathways play vital roles in cell growth, division and motility. Cross-talk between the pathways amplifies their roles in cell proliferation and motility and its dysregulation is involved in disease pathogenesis. One important interaction for cross-talk occurs between p120RasGAP (RASA1), a GTPase activating protein (GAP) for Ras, and p190RhoGAP (p190RhoGAP-A, ARHGAP35), a GAP for Rho. The binding of these proteins is primarily mediated by two SH2 domains within p120RasGAP engaging phosphorylated tyrosines of p190RhoGAP, of which the best studied is pTyr-1105. To better understand the interaction between p120RasGAP and p190RhoGAP, we determined the 1.75 Å X-ray crystal structure of the N-terminal SH2 domain of p120RasGAP in the unliganded form, and its 1.6 Å co-crystal structure in complex with a synthesized phosphotyrosine peptide, EEENI(p-Tyr)SVPHDST, corresponding to residues 1100-1112 of p190RhoGAP. We find that the N-terminal SH2 domain of p120RhoGAP has the characteristic SH2 fold encompassing a central beta-sheet flanked by two alpha-helices, and that peptide binding stabilizes specific conformations of the βE-βF loop and arginine residues R212 and R231. Site-directed mutagenesis and native gel shifts confirm phosphotyrosine binding through the conserved FLVR motif arginine residue R207, and isothermal titration calorimetry finds a dissociation constant of 0.3 ± 0.1 μM between the phosphopeptide and SH2 domain. These results demonstrate that the major interaction between two important GAP proteins, p120RasGAP and p190RhoGAP, is mediated by a canonical SH2-pTyr interaction.


    Organizational Affiliation

    Yale Cancer Center, Yale University, New Haven, Connecticut, United States of America.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ras GTPase-activating protein 1A109Homo sapiensMutation(s): 2 
Gene Names: RASA1GAPRASA
UniProt & NIH Common Fund Data Resources
Find proteins for P20936 (Homo sapiens)
Explore P20936 
Go to UniProtKB:  P20936
PHAROS:  P20936
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
phosphopeptide of p190RhoGAPB [auth U]14Homo sapiensMutation(s): 0 
Gene Names: ARHGAP35GRF1GRLF1KIAA1722P190Ap190ARHOGAP
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NRY4 (Homo sapiens)
Explore Q9NRY4 
Go to UniProtKB:  Q9NRY4
PHAROS:  Q9NRY4
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PTR
Query on PTR
B [auth U]L-PEPTIDE LINKINGC9 H12 N O6 PTYR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: I 2 2 2
  • Diffraction Data DOI: 10.15785/SBGRID/699 SBGrid
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.19α = 90
b = 64.827β = 90
c = 87.239γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM102262

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-18
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Structure summary
  • Version 1.2: 2020-01-15
    Changes: Database references