4KH3

Structure of a bacterial self-associating protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.172 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The antigen 43 structure reveals a molecular Velcro-like mechanism of autotransporter-mediated bacterial clumping.

Heras, B.Totsika, M.Peters, K.M.Paxman, J.J.Gee, C.L.Jarrott, R.J.Perugini, M.A.Whitten, A.E.Schembri, M.A.

(2014) Proc Natl Acad Sci U S A 111: 457-462

  • DOI: 10.1073/pnas.1311592111
  • Primary Citation of Related Structures:  
    4KH3

  • PubMed Abstract: 
  • Aggregation and biofilm formation are critical mechanisms for bacterial resistance to host immune factors and antibiotics. Autotransporter (AT) proteins, which represent the largest group of outer-membrane and secreted proteins in Gram-negative bacteria, contribute significantly to these phenotypes ...

    Aggregation and biofilm formation are critical mechanisms for bacterial resistance to host immune factors and antibiotics. Autotransporter (AT) proteins, which represent the largest group of outer-membrane and secreted proteins in Gram-negative bacteria, contribute significantly to these phenotypes. Despite their abundance and role in bacterial pathogenesis, most AT proteins have not been structurally characterized, and there is a paucity of detailed information with regard to their mode of action. Here we report the structure-function relationships of Antigen 43 (Ag43a), a prototypic self-associating AT protein from uropathogenic Escherichia coli. The functional domain of Ag43a displays a twisted L-shaped β-helical structure firmly stabilized by a 3D hydrogen-bonded scaffold. Notably, the distinctive Ag43a L shape facilitates self-association and cell aggregation. Combining all our data, we define a molecular "Velcro-like" mechanism of AT-mediated bacterial clumping, which can be tailored to fit different bacterial lifestyles such as the formation of biofilms.


    Organizational Affiliation

    Department of Biochemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC 3086, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Antigen 43A503Escherichia coli CFT073Mutation(s): 0 
Gene Names: agn43c3655
UniProt
Find proteins for A0A0H2VAW5 (Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC))
Explore A0A0H2VAW5 
Go to UniProtKB:  A0A0H2VAW5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.172 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.045α = 90
b = 106.045β = 90
c = 147.545γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
SOLVEphasing
PHENIXrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-15
    Type: Initial release
  • Version 1.1: 2014-02-05
    Changes: Derived calculations
  • Version 1.2: 2015-06-17
    Changes: Database references