Model for extended volume of truncated monomeric Cytohesin-3 (Grp1; amino acids 63-399) E161A Arf6 Q67L fusion protein

Experimental Data Snapshot

  • Resolution: 35.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structural Dynamics Control Allosteric Activation of Cytohesin Family Arf GTPase Exchange Factors.

Malaby, A.W.Das, S.Chakravarthy, S.Irving, T.C.Bilsel, O.Lambright, D.G.

(2018) Structure 26: 106-117.e6

  • DOI: https://doi.org/10.1016/j.str.2017.11.019
  • Primary Citation of Related Structures:  
    6BBP, 6BBQ

  • PubMed Abstract: 

    Membrane dynamic processes including vesicle biogenesis depend on Arf guanosine triphosphatase (GTPase) activation by guanine nucleotide exchange factors (GEFs) containing a catalytic Sec7 domain and a membrane-targeting module such as a pleckstrin homology (PH) domain. The catalytic output of cytohesin family Arf GEFs is controlled by autoinhibitory interactions that impede accessibility of the exchange site in the Sec7 domain. These restraints can be relieved through activator Arf-GTP binding to an allosteric site comprising the PH domain and proximal autoinhibitory elements (Sec7-PH linker and C-terminal helix). Small-angle X-ray scattering and negative-stain electron microscopy were used to investigate the structural organization and conformational dynamics of cytohesin-3 (Grp1) in autoinhibited and active states. The results support a model in which hinge dynamics in the autoinhibited state expose the activator site for Arf-GTP binding, while subsequent C-terminal helix unlatching and repositioning unleash conformational entropy in the Sec7-PH linker to drive exposure of the exchange site.

  • Organizational Affiliation

    Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA; Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01655, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytohesin-3,ADP-ribosylation factor 6520Mus musculusHomo sapiens
This entity is chimeric
Mutation(s): 1 
Gene Names: Cyth3Grp1Pscd3ARF6
UniProt & NIH Common Fund Data Resources
Find proteins for P62330 (Homo sapiens)
Explore P62330 
Go to UniProtKB:  P62330
GTEx:  ENSG00000165527 
Find proteins for O08967 (Mus musculus)
Explore O08967 
Go to UniProtKB:  O08967
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP62330O08967
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
4IP BindingDB:  6BBQ Kd: 100 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 35.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM 056324

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-10
    Type: Initial release
  • Version 1.1: 2018-01-17
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.3: 2023-11-29
    Changes: Data collection, Database references