N-GTPase domain of p190RhoGAP-A

  • Classification: HYDROLASE
  • Organism(s): Rattus norvegicus
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2018-04-18 Released: 2018-09-12 
  • Deposition Author(s): Stiegler, A.L., Boggon, T.J.
  • Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)

Experimental Data Snapshot

  • Resolution: 2.80 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.250 
  • R-Value Observed: 0.252 

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This is version 1.3 of the entry. See complete history


The N-Terminal GTPase Domain of p190RhoGAP Proteins Is a PseudoGTPase.

Stiegler, A.L.Boggon, T.J.

(2018) Structure 26: 1451

  • DOI: https://doi.org/10.1016/j.str.2018.07.015
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The pseudoGTPases are a rapidly growing and important group of pseudoenzymes. p190RhoGAP proteins are critical regulators of Rho signaling and contain two previously identified pseudoGTPase domains. Here we report that p190RhoGAP proteins contain a third pseudoGTPase domain, termed N-GTPase. We find that GTP constitutively purifies with the N-GTPase domain, and a 2.8-Å crystal structure of p190RhoGAP-A co-purified with GTP reveals an unusual GTP-Mg 2+ binding pocket. Six inserts in N-GTPase indicate perturbed catalytic activity and inability to bind to canonical GTPase activating proteins, guanine nucleotide exchange factors, and effector proteins. Biochemical analysis shows that N-GTPase does not detectably hydrolyze GTP, and exchanges nucleotide only under harsh Mg 2+ chelation. Furthermore, mutational analysis shows that GTP and Mg 2+ binding stabilizes the domain. Therefore, our results support that N-GTPase is a nucleotide binding, non-hydrolyzing, pseudoGTPase domain that may act as a protein-protein interaction domain. Thus, unique among known proteins, p190RhoGAPs contain three pseudoGTPase domains.

  • Organizational Affiliation

    Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Rho GTPase-activating protein 35
A, B
271Rattus norvegicusMutation(s): 0 
Gene Names: Arhgap35Grlf1P190Ap190ARHOGAP
Find proteins for P81128 (Rattus norvegicus)
Explore P81128 
Go to UniProtKB:  P81128
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP81128
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.69α = 90
b = 69.27β = 90
c = 154.06γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM114621
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM102262
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesNS085078

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-12
    Type: Initial release
  • Version 1.1: 2018-11-21
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.3: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description