Translocator domain of autotransporter NalP from Neisseria meningitidis

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

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Structure of the Translocator Domain of a Bacterial Autotransporter

Oomen, C.J.Van Ulsen, P.Van Gelder, P.Feijen, M.Tommassen, J.Gros, P.

(2004) EMBO J 23: 1257

  • DOI: https://doi.org/10.1038/sj.emboj.7600148
  • Primary Citation of Related Structures:  
    1UYN, 1UYO

  • PubMed Abstract: 

    Autotransporters are virulence-related proteins of Gram-negative bacteria that are secreted via an outer-membrane-based C-terminal extension, the translocator domain. This domain supposedly is sufficient for the transport of the N-terminal passenger domain across the outer membrane. We present here the crystal structure of the in vitro-folded translocator domain of the autotransporter NalP from Neisseria meningitidis, which reveals a 12-stranded beta-barrel with a hydrophilic pore of 10 x 12.5 A that is filled by an N-terminal alpha-helix. The domain has pore activity in vivo and in vitro. Our data are consistent with the model of passenger-domain transport through the hydrophilic channel within the beta-barrel, and inconsistent with a model for transport through a central channel formed by an oligomer of translocator domains. However, the dimensions of the pore imply translocation of the secreted domain in an unfolded form. An alternative model, possibly covering the transport of folded domains, is that passenger-domain transport involves the Omp85 complex, the machinery required for membrane insertion of outer-membrane proteins, on which autotransporters are dependent.

  • Organizational Affiliation

    Department of Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, The Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NALPA [auth X]308Neisseria meningitidisMutation(s): 0 
Membrane Entity: Yes 
Find proteins for E6MVD9 (Neisseria meningitidis serogroup B / serotype 15 (strain H44/76))
Explore E6MVD9 
Go to UniProtKB:  E6MVD9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE6MVD9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.97α = 90
b = 57.97β = 90
c = 346.435γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-03-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other