4OR1

Structure and mechanism of fibronectin binding and biofilm formation of enteroaggregative Escherischia coli AAF fimbriae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insight into host recognition by aggregative adherence fimbriae of enteroaggregative Escherichia coli.

Berry, A.A.Yang, Y.Pakharukova, N.Garnett, J.A.Lee, W.C.Cota, E.Marchant, J.Roy, S.Tuittila, M.Liu, B.Inman, K.G.Ruiz-Perez, F.Mandomando, I.Nataro, J.P.Zavialov, A.V.Matthews, S.

(2014) PLoS Pathog 10: e1004404-e1004404

  • DOI: 10.1371/journal.ppat.1004404
  • Primary Citation of Related Structures:  
    2MPV, 4PH8, 4PHX, 4OR1

  • PubMed Abstract: 
  • Enteroaggregative Escherichia coli (EAEC) is a leading cause of acute and persistent diarrhea worldwide. A recently emerged Shiga-toxin-producing strain of EAEC resulted in significant mortality and morbidity due to progressive development of hemolyt ...

    Enteroaggregative Escherichia coli (EAEC) is a leading cause of acute and persistent diarrhea worldwide. A recently emerged Shiga-toxin-producing strain of EAEC resulted in significant mortality and morbidity due to progressive development of hemolytic-uremic syndrome. The attachment of EAEC to the human intestinal mucosa is mediated by aggregative adherence fimbria (AAF). Using X-ray crystallography and NMR structures, we present new atomic resolution insight into the structure of AAF variant I from the strain that caused the deadly outbreak in Germany in 2011, and AAF variant II from archetype strain 042, and propose a mechanism for AAF-mediated adhesion and biofilm formation. Our work shows that major subunits of AAF assemble into linear polymers by donor strand complementation where a single minor subunit is inserted at the tip of the polymer by accepting the donor strand from the terminal major subunit. Whereas the minor subunits of AAF have a distinct conserved structure, AAF major subunits display large structural differences, affecting the overall pilus architecture. These structures suggest a mechanism for AAF-mediated adhesion and biofilm formation. Binding experiments using wild type and mutant subunits (NMR and SPR) and bacteria (ELISA) revealed that despite the structural differences AAF recognize a common receptor, fibronectin, by employing clusters of basic residues at the junction between subunits in the pilus. We show that AAF-fibronectin attachment is based primarily on electrostatic interactions, a mechanism not reported previously for bacterial adhesion to biotic surfaces.


    Organizational Affiliation

    Centre for Structural Biology, Department of Life Sciences, Imperial College London, South Kensington, London, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Invasin homolog AafB, Major fimbrial subunit of aggregative adherence fimbria II AafA chimeric constructAB155Escherichia coliMutation(s): 0 
Gene Names: aafBaafA
Find proteins for O30595 (Escherichia coli)
Explore O30595 
Go to UniProtKB:  O30595
Find proteins for Q9X4L4 (Escherichia coli)
Explore Q9X4L4 
Go to UniProtKB:  Q9X4L4
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
ACT
Query on ACT

Download Ideal Coordinates CCD File 
B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.221 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.755α = 90
b = 81.755β = 90
c = 222.703γ = 120
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-12-24
    Type: Initial release
  • Version 1.1: 2017-08-09
    Changes: Data collection, Refinement description, Source and taxonomy