Crystal Structure of the Pseudomonas functional amyloid secretion protein FapF - R157A mutant

Experimental Data Snapshot

  • Resolution: 3.08 Å
  • R-Value Free: 0.369 
  • R-Value Work: 0.319 
  • R-Value Observed: 0.322 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.1 of the entry. See complete history


A new class of hybrid secretion system is employed in Pseudomonas amyloid biogenesis.

Rouse, S.L.Hawthorne, W.J.Berry, J.L.Chorev, D.S.Ionescu, S.A.Lambert, S.Stylianou, F.Ewert, W.Mackie, U.Morgan, R.M.L.Otzen, D.Herbst, F.A.Nielsen, P.H.Dueholm, M.Bayley, H.Robinson, C.V.Hare, S.Matthews, S.

(2017) Nat Commun 8: 263-263

  • DOI: https://doi.org/10.1038/s41467-017-00361-6
  • Primary Citation of Related Structures:  
    5O65, 5O67, 5O68

  • PubMed Abstract: 

    Gram-negative bacteria possess specialised biogenesis machineries that facilitate the export of amyloid subunits for construction of a biofilm matrix. The secretion of bacterial functional amyloid requires a bespoke outer-membrane protein channel through which unfolded amyloid substrates are translocated. Here, we combine X-ray crystallography, native mass spectrometry, single-channel electrical recording, molecular simulations and circular dichroism measurements to provide high-resolution structural insight into the functional amyloid transporter from Pseudomonas, FapF. FapF forms a trimer of gated β-barrel channels in which opening is regulated by a helical plug connected to an extended coil-coiled platform spanning the bacterial periplasm. Although FapF represents a unique type of secretion system, it shares mechanistic features with a diverse range of peptide translocation systems. Our findings highlight alternative strategies for handling and export of amyloid protein sequences.Gram-negative bacteria assemble biofilms from amyloid fibres, which translocate across the outer membrane as unfolded amyloid precursors through a secretion system. Here, the authors characterise the structural details of the amyloid transporter FapF in Pseudomonas.

  • Organizational Affiliation

    Department of Life Sciences, Imperial College London, South Kensington Campus, London, SW72AZ, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
334Pseudomonas sp. UK4Mutation(s): 1 
Gene Names: fapFPSUK4_00060
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.08 Å
  • R-Value Free: 0.369 
  • R-Value Work: 0.319 
  • R-Value Observed: 0.322 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.587α = 87.09
b = 125.708β = 84.7
c = 142.667γ = 89.92
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom100280
Wellcome TrustUnited Kingdom104833

Revision History  (Full details and data files)

  • Version 1.0: 2017-08-23
    Type: Initial release
  • Version 1.1: 2024-05-01
    Changes: Data collection, Database references, Refinement description