4UV3

Structure of the curli transport lipoprotein CsgG in its membrane- bound conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.59 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.297 
  • R-Value Observed: 0.299 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural and Mechanistic Insights Into the Bacterial Amyloid Secretion Channel Csgg.

Goyal, P.Krasteva, P.V.Van Gerven, N.Gubellini, F.Van Den Broeck, I.Troupiotis-Tsailaki, A.Jonckheere, W.Pehau-Arnaudet, G.Pinkner, J.S.Chapman, M.R.Hultgren, S.J.Howorka, S.Fronzes, R.Remaut, H.

(2014) Nature 516: 250

  • DOI: 10.1038/nature13768
  • Primary Citation of Related Structures:  
    4UV2, 4UV3

  • PubMed Abstract: 
  • Curli are functional amyloid fibres that constitute the major protein component of the extracellular matrix in pellicle biofilms formed by Bacteroidetes and Proteobacteria (predominantly of the α and γ classes). They provide a fitness advantage in pa ...

    Curli are functional amyloid fibres that constitute the major protein component of the extracellular matrix in pellicle biofilms formed by Bacteroidetes and Proteobacteria (predominantly of the α and γ classes). They provide a fitness advantage in pathogenic strains and induce a strong pro-inflammatory response during bacteraemia. Curli formation requires a dedicated protein secretion machinery comprising the outer membrane lipoprotein CsgG and two soluble accessory proteins, CsgE and CsgF. Here we report the X-ray structure of Escherichia coli CsgG in a non-lipidated, soluble form as well as in its native membrane-extracted conformation. CsgG forms an oligomeric transport complex composed of nine anticodon-binding-domain-like units that give rise to a 36-stranded β-barrel that traverses the bilayer and is connected to a cage-like vestibule in the periplasm. The transmembrane and periplasmic domains are separated by a 0.9-nm channel constriction composed of three stacked concentric phenylalanine, asparagine and tyrosine rings that may guide the extended polypeptide substrate through the secretion pore. The specificity factor CsgE forms a nonameric adaptor that binds and closes off the periplasmic face of the secretion channel, creating a 24,000 Å(3) pre-constriction chamber. Our structural, functional and electrophysiological analyses imply that CsgG is an ungated, non-selective protein secretion channel that is expected to employ a diffusion-based, entropy-driven transport mechanism.


    Organizational Affiliation

    1] Structural and Molecular Microbiology, Structural Biology Research Center, VIB, Pleinlaan 2, 1050 Brussels, Belgium [2] Structural Biology Brussels, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CURLI PRODUCTION ASSEMBLY/TRANSPORT COMPONENT CSGGABCDEFGHIJKLMNOPQR262Escherichia coli str. K-12 substr. MC4100Mutation(s): 0 
Find proteins for P0AEA2 (Escherichia coli (strain K12))
Explore P0AEA2 
Go to UniProtKB:  P0AEA2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.59 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.297 
  • R-Value Observed: 0.299 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 161.934α = 90
b = 372.847β = 92.9
c = 161.972γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2014-09-24
    Type: Initial release
  • Version 1.1: 2014-12-17
    Changes: Database references