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

Journal Article · · PLoS ONE
 [1];  [2]; ORCiD logo [2];  [3]
  1. Yale College, New Haven, CT (United States); Yale Univ., New Haven, CT (United States)
  2. Yale Univ., New Haven, CT (United States)
  3. Univ. i Bergen (Norway)

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Inst. of Health; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1591894
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 12 Vol. 14; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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The language of SH2 domain interactions defines phosphotyrosine-mediated signal transduction journal May 2012
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Crystal structure of the phosphotyrosine recognition domain SH2 of v-src complexed with tyrosine-phosphorylated peptides journal August 1992
Structure of an SH2 domain of the p85α subunit of phosphatidylinositol-3-OH kinase journal August 1992
Recognition of a high-affinity phosphotyrosyl peptide by the Src homology-2 domain of p56lck journal March 1993
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Two SH2 Domains of p120 Ras GTPase-activating Protein Bind Synergistically to Tyrosine Phosphorylated p190 Rho GTPase-activating Protein journal July 1995
p190-B, a New Member of the Rho GAP Family, and Rho Are Induced to Cluster after Integrin Cross-linking journal December 1995
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Role of P120 Ras-Gap in Directed Cell Movement journal April 2000
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RhoA Inactivation by p190RhoGAP Regulates Cell Spreading and Migration by Promoting Membrane Protrusion and Polarity journal September 2001
Integrin Signaling through Arg Activates p190RhoGAP by Promoting Its Binding to p120RasGAP and Recruitment to the Membrane journal November 2006
Tandem SH2 binding sites mediate the RasGAP-RhoGAP interaction: a conformational mechanism for SH3 domain regulation journal February 1997
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Guanosine triphosphatase activating protein (GAP) interacts with the p21 ras effector binding domain journal April 1988
Protein-tyrosine kinases regulate the phosphorylation, protein interactions, subcellular distribution, and activity of p21ras GTPase-activating protein. journal April 1991
Specific motifs recognized by the SH2 domains of Csk, 3BP2, fps/fes, GRB-2, HCP, SHC, Syk, and Vav. journal April 1994
Aberrant Ras regulation and reduced p190 tyrosine phosphorylation in cells lacking p120-Gap. journal April 1997
Phosphotyrosine (p-Tyr)-Dependent and -Independent Mechanisms of p190 RhoGAP-p120 RasGAP Interaction: Tyr 1105 of p190, a Substrate for c-Src, Is the Sole p-Tyr Mediator of Complex Formation journal December 1998
Protein-tyrosine kinases regulate the phosphorylation, protein interactions, subcellular distribution, and activity of p21ras GTPase-activating protein journal April 1991
Specific motifs recognized by the SH2 domains of Csk, 3BP2, fps/fes, GRB-2, HCP, SHC, Syk, and Vav journal April 1994
ras Genes journal June 1987
p120RasGAP-Mediated Activation of c-Src Is Critical for Oncogenic Ras to Induce Tumor Invasion journal March 2012
Phosphorylation of p190 on Tyr1105 by c-Src is necessary but not sufficient for EGF-induced actin disassembly in C3H10T1/2 fibroblasts journal May 2001
Inhibition of Rho via Arg and p190RhoGAP in the Postnatal Mouse Hippocampus Regulates Dendritic Spine Maturation, Synapse and Dendrite Stability, and Behavior journal October 2007
p190RhoGAP negatively regulates Rho activity at the cleavage furrow of mitotic cells text January 2009
RhoA Inactivation by p190RhoGAP Regulates Cell Spreading and Migration by Promoting Membrane Protrusion and Polarity text January 2001
PHENIX: a comprehensive Python-based system for macromolecular structure solution. text January 2010
Iterative model building, structure refinement and density modification with the PHENIX AutoBuild wizard. journalarticle January 2008
MiR-744 functions as a proto-oncogene in nasopharyngeal carcinoma progression and metastasis via transcriptional control of ARHGAP5 journal April 2015
p190RhoGAPs, the ARHGAP35- and ARHGAP5-Encoded Proteins, in Health and Disease journal April 2019
Data publication with the structural biology data grid supports live analysis text January 2016
Parkes Weber syndrome, vein of Galen aneurysmal malformation, and other fast-flow vascular anomalies are caused by RASA1 mutations text January 2008
Collaboration gets the most out of software journal September 2013

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