Crystal Structure of the Amyloid-like IYQYGG segment from the R1 repeat of the E. coli Biofilm-associated CsgA Curli protein

Experimental Data Snapshot

  • Resolution: 1.65 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.148 

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This is version 1.2 of the entry. See complete history


Structural Insights into Curli CsgA Cross-beta Fibril Architecture Inspire Repurposing of Anti-amyloid Compounds as Anti-biofilm Agents.

Perov, S.Lidor, O.Salinas, N.Golan, N.Tayeb-Fligelman, E.Deshmukh, M.Willbold, D.Landau, M.

(2019) PLoS Pathog 15: e1007978-e1007978

  • DOI: https://doi.org/10.1371/journal.ppat.1007978
  • Primary Citation of Related Structures:  
    6G8C, 6G8D, 6G8E, 6G9G

  • PubMed Abstract: 

    Curli amyloid fibrils secreted by Enterobacteriaceae mediate host cell adhesion and contribute to biofilm formation, thereby promoting bacterial resistance to environmental stressors. Here, we present crystal structures of amyloid-forming segments from the major curli subunit, CsgA, revealing steric zipper fibrils of tightly mated β-sheets, demonstrating a structural link between curli and human pathological amyloids. D-enantiomeric peptides, originally developed to interfere with Alzheimer's disease-associated amyloid-β, inhibited CsgA fibrillation and reduced biofilm formation in Salmonella typhimurium. Moreover, as previously shown, CsgA fibrils cross-seeded fibrillation of amyloid-β, providing support for the proposed structural resemblance and potential for cross-species amyloid interactions. The presented findings provide structural insights into amyloidogenic regions important for curli formation, suggest a novel strategy for disrupting amyloid-structured biofilms, and hypothesize on the formation of self-propagating prion-like species originating from a microbial source that could influence neurodegenerative diseases.

  • Organizational Affiliation

    Department of Biology, Technion-Israel Institute of Technology, Haifa, Israel.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Major curlin subunitA [auth B]6Escherichia coli K-12Mutation(s): 0 
Find proteins for P28307 (Escherichia coli (strain K12))
Explore P28307 
Go to UniProtKB:  P28307
Entity Groups  
UniProt GroupP28307
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.65 Å
  • R-Value Free: 0.178 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.148 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.17α = 90
b = 4.76β = 102.43
c = 19.6γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-04-24
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.2: 2024-05-01
    Changes: Data collection, Database references, Refinement description