6BBP

Model for compact volume of truncated monomeric Cytohesin-3 (Grp1; amino acids 63-399) E161A 6GS Arf6 Q67L fusion protein


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 35 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1016/j.str.2017.11.019
  • Primary Citation of Related Structures:  

  • 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 h ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytohesin-3,ADP-ribosylation factor 6
A
520Homo sapiensMus musculus
This entity is chimeric
Mutation(s): 1 
Gene Names: ARF6, Cyth3 (Grp1, Pscd3)
Find proteins for P62330 (Homo sapiens)
Go to Gene View: ARF6
Go to UniProtKB:  P62330
Find proteins for O08967 (Mus musculus)
Go to UniProtKB:  O08967
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download SDF File 
Download CCD File 
A
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
4IP
Query on 4IP

Download SDF File 
Download CCD File 
A
INOSITOL-(1,3,4,5)-TETRAKISPHOSPHATE
C6 H16 O18 P4
CIPFCGZLFXVXBG-CNWJWELYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 35 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM 056324

Revision History 

  • Version 1.0: 2018-01-10
    Type: Initial release
  • Version 1.1: 2018-01-17
    Type: Author supporting evidence