4PH8

Crystal structure of AggA, the major subunit of aggregative adherence fimbriae type I (AAF/I) from the Escherichia coli O4H104


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.160 

wwPDB Validation   3D Report Full Report



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:  
    4PH8, 4PHX, 4OR1, 2MPV

  • 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.


    Related Citations: 
    • Crystallization and sulfur SAD phasing of AggA, the major subunit of aggregative adherence fimbriae type I from the Escherichia coli strain that caused an outbreak of haemolytic-uraemic syndrome in Germany.
      Pakharukova, N., Tuittila, M., Zavialov, A.
      (2013) Acta Crystallogr Sect F Struct Biol Cryst Commun 69: 1389

    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
Aggregative adherence fimbrial subunit AggAAB156Escherichia coli O104:H4 str. C227-11Mutation(s): 0 
Gene Names: EUAG_05069
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
A, B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.156 
  • R-Value Observed: 0.160 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.832α = 90
b = 80.172β = 90
c = 91.416γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement
PHASERphasing
XDSdata reduction
XSCALEdata reduction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Academy of FinlandFinlandFA-136333
Academy of FinlandFinlandFA-140959
Erasmus MumdusFinlandTRIPLEI2011311

Revision History 

  • Version 1.0: 2014-10-01
    Type: Initial release