B2 domain of Neisseria meningitidis Pilus assembly protein PilQ

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 

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Structure and Assembly of a Trans-Periplasmic Channel for Type Iv Pili in Neisseria Meningitidis.

Berry, J.L.Phelan, M.M.Collins, R.F.Adomavicius, T.Tonjum, T.Frye, S.A.Bird, L.Owens, R.Ford, R.C.Lian, L.Y.Derrick, J.P.

(2012) PLoS Pathog 8: 2923

  • DOI: https://doi.org/10.1371/journal.ppat.1002923
  • Primary Citation of Related Structures:  
    4AQZ, 4AR0, 4AV2

  • PubMed Abstract: 

    Type IV pili are polymeric fibers which protrude from the cell surface and play a critical role in adhesion and invasion by pathogenic bacteria. The secretion of pili across the periplasm and outer membrane is mediated by a specialized secretin protein, PilQ, but the way in which this large channel is formed is unknown. Using NMR, we derived the structures of the periplasmic domains from N. meningitidis PilQ: the N-terminus is shown to consist of two β-domains, which are unique to the type IV pilus-dependent secretins. The structure of the second β-domain revealed an eight-stranded β-sandwich structure which is a novel variant of the HSP20-like fold. The central part of PilQ consists of two α/β fold domains: the structure of the first of these is similar to domains from other secretins, but with an additional α-helix which links it to the second α/β domain. We also determined the structure of the entire PilQ dodecamer by cryoelectron microscopy: it forms a cage-like structure, enclosing a cavity which is approximately 55 Å in internal diameter at its largest extent. Specific regions were identified in the density map which corresponded to the individual PilQ domains: this allowed us to dock them into the cryoelectron microscopy density map, and hence reconstruct the entire PilQ assembly which spans the periplasm. We also show that the C-terminal domain from the lipoprotein PilP, which is essential for pilus assembly, binds specifically to the first α/β domain in PilQ and use NMR chemical shift mapping to generate a model for the PilP:PilQ complex. We conclude that passage of the pilus fiber requires disassembly of both the membrane-spanning and the β-domain regions in PilQ, and that PilP plays an important role in stabilising the PilQ assembly during secretion, through its anchorage in the inner membrane.

  • Organizational Affiliation

    Faculty of Life Sciences, Michael Smith Building, University of Manchester, Manchester, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Find proteins for Q70M91 (Neisseria meningitidis serogroup B (strain MC58))
Explore Q70M91 
Go to UniProtKB:  Q70M91
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UniProt GroupQ70M91
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: LOWEST ENERGY 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-17
    Type: Initial release
  • Version 2.0: 2023-06-14
    Changes: Atomic model, Data collection, Database references, Other