Crystal Structure of the Vibrio cholerae ATPase GspE Hexamer

Experimental Data Snapshot

  • Resolution: 4.20 Å
  • R-Value Free: 0.376 
  • R-Value Work: 0.384 
  • R-Value Observed: 0.384 

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Hexamers of the Type II Secretion ATPase GspE from Vibrio cholerae with Increased ATPase Activity.

Lu, C.Turley, S.Marionni, S.T.Park, Y.J.Lee, K.K.Patrick, M.Shah, R.Sandkvist, M.Bush, M.F.Hol, W.G.

(2013) Structure 21: 1707-1717

  • DOI: https://doi.org/10.1016/j.str.2013.06.027
  • Primary Citation of Related Structures:  
    4KSR, 4KSS

  • PubMed Abstract: 

    The type II secretion system (T2SS), a multiprotein machinery spanning two membranes in Gram-negative bacteria, is responsible for the secretion of folded proteins from the periplasm across the outer membrane. The critical multidomain T2SS assembly ATPase GspE(EpsE) had not been structurally characterized as a hexamer. Here, four hexamers of Vibrio cholerae GspE(EpsE) are obtained when fused to Hcp1 as an assistant hexamer, as shown with native mass spectrometry. The enzymatic activity of the GspE(EpsE)-Hcp1 fusions is ∼20 times higher than that of a GspE(EpsE) monomer, indicating that increasing the local concentration of GspE(EpsE) by the fusion strategy was successful. Crystal structures of GspE(EpsE)-Hcp1 fusions with different linker lengths reveal regular and elongated hexamers of GspE(EpsE) with major differences in domain orientation within subunits, and in subunit assembly. SAXS studies on GspE(EpsE)-Hcp1 fusions suggest that even further variability in GspE(EpsE) hexamer architecture is likely.

  • Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Type II secretion system protein E, Hemolysin-coregulated protein
A, B, C
583Vibrio cholerae O1 biovar El Tor str. N16961Pseudomonas aeruginosa UCBPP-PA14
This entity is chimeric
Mutation(s): 0 
Gene Names: epsEVC_2732PA14_01030
Find proteins for A0A0H2ZJ24 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore A0A0H2ZJ24 
Go to UniProtKB:  A0A0H2ZJ24
Find proteins for P37093 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore P37093 
Go to UniProtKB:  P37093
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP37093A0A0H2ZJ24
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.20 Å
  • R-Value Free: 0.376 
  • R-Value Work: 0.384 
  • R-Value Observed: 0.384 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.467α = 90
b = 132.911β = 90
c = 142.75γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-10-09
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references