Crystal structure of AggB, the minor subunit of aggregative adherence fimbriae type I from the Escherichia coli O4H104

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

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This is version 1.2 of the entry. See complete history


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

  • 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 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

    Center for Vaccine Development, Department of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland, United States of America.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein AggB142Escherichia coliMutation(s): 0 
Gene Names: aggB
Find proteins for P46006 (Escherichia coli)
Explore P46006 
Go to UniProtKB:  P46006
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP46006
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.797α = 90
b = 163.968β = 90
c = 58.627γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Academy of FinlandFinlandFA-136333
Academy of FinlandFinlandFA-140959
Erasmus MundusFinlandTRIPLEI2011311

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-01
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Advisory, Data collection, Derived calculations
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Refinement description