Best fitting antiparallel model for Volume 1 of truncated dimeric Cytohesin-3 (Grp1; amino acids 14-399)

Experimental Data Snapshot

  • Resolution: 53.0 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Structural Organization and Dynamics of Homodimeric Cytohesin Family Arf GTPase Exchange Factors in Solution and on Membranes.

Das, S.Malaby, A.W.Nawrotek, A.Zhang, W.Zeghouf, M.Maslen, S.Skehel, M.Chakravarthy, S.Irving, T.C.Bilsel, O.Cherfils, J.Lambright, D.G.

(2019) Structure 27: 1782

  • DOI: https://doi.org/10.1016/j.str.2019.09.007
  • Primary Citation of Related Structures:  
    6U3E, 6U3G

  • PubMed Abstract: 

    Membrane dynamic processes require Arf GTPase activation by guanine nucleotide exchange factors (GEFs) with a Sec7 domain. Cytohesin family Arf GEFs function in signaling and cell migration through Arf GTPase activation on the plasma membrane and endosomes. In this study, the structural organization of two cytohesins (Grp1 and ARNO) was investigated in solution by size exclusion-small angle X-ray scattering and negative stain-electron microscopy and on membranes by dynamic light scattering, hydrogen-deuterium exchange-mass spectrometry and guanosine diphosphate (GDP)/guanosine triphosphate (GTP) exchange assays. The results suggest that cytohesins form elongated dimers with a central coiled coil and membrane-binding pleckstrin-homology (PH) domains at opposite ends. The dimers display significant conformational heterogeneity, with a preference for compact to intermediate conformations. Phosphoinositide-dependent membrane recruitment is mediated by one PH domain at a time and alters the conformational dynamics to prime allosteric activation by Arf-GTP. A structural model for membrane targeting and allosteric activation of full-length cytohesin dimers is discussed.

  • Organizational Affiliation

    Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA 01605, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
397Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O43739 (Homo sapiens)
Explore O43739 
Go to UniProtKB:  O43739
PHAROS:  O43739
GTEx:  ENSG00000008256 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43739
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 4IP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C6 H16 O18 P4
Binding Affinity Annotations 
IDSourceBinding Affinity
4IP BindingDB:  6U3E Kd: 100 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 53.0 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 StatesGM056324

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-25
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.2: 2019-12-18
    Changes: Database references
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.4: 2023-11-29
    Changes: Data collection, Database references, Refinement description