Crystal structure of the N-terminal DCB-HUS domain of T. terrestris Sec7

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.214 

wwPDB Validation   3D Report Full Report

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The Sec7 N-terminal regulatory domains facilitate membrane-proximal activation of the Arf1 GTPase.

Richardson, B.C.Halaby, S.L.Gustafson, M.A.Fromme, J.C.

(2016) Elife 5

  • DOI: https://doi.org/10.7554/eLife.12411
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Golgi complex is the central sorting compartment of eukaryotic cells. Arf guanine nucleotide exchange factors (Arf-GEFs) regulate virtually all traffic through the Golgi by activating Arf GTPase trafficking pathways. The Golgi Arf-GEFs contain multiple autoregulatory domains, but the precise mechanisms underlying their function remain largely undefined. We report a crystal structure revealing that the N-terminal DCB and HUS regulatory domains of the Arf-GEF Sec7 form a single structural unit. We demonstrate that the established role of the N-terminal region in dimerization is not conserved; instead, a C-terminal autoinhibitory domain is responsible for dimerization of Sec7. We find that the DCB/HUS domain amplifies the ability of Sec7 to activate Arf1 on the membrane surface by facilitating membrane insertion of the Arf1 amphipathic helix. This enhancing function of the Sec7 N-terminal domains is consistent with the high rate of Arf1-dependent trafficking to the plasma membrane necessary for maximal cell growth.

  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Cornell University, Ithaca, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
468Thermothielavioides terrestrisMutation(s): 0 
Gene Names: Sec7
Find proteins for A0A140UHP8 (Thermothielavioides terrestris)
Explore A0A140UHP8 
Go to UniProtKB:  A0A140UHP8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A140UHP8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.472α = 90
b = 132.024β = 90
c = 247.664γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM098621

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-27
    Type: Initial release
  • Version 1.1: 2017-09-27
    Changes: Author supporting evidence, Derived calculations
  • Version 1.2: 2019-12-25
    Changes: Author supporting evidence