4KH3

Structure of a bacterial self-associating protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.168 

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.USA 111: 457-462

  • DOI: 10.1073/pnas.1311592111

  • 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 bacte ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Antigen 43
A
503Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC)Mutation(s): 0 
Find proteins for A0A0H2VAW5 (Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC))
Go to UniProtKB:  A0A0H2VAW5
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MLI
Query on MLI

Download SDF File 
Download CCD File 
A
MALONATE ION
C3 H2 O4
OFOBLEOULBTSOW-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.168 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 106.045α = 90.00
b = 106.045β = 90.00
c = 147.545γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
Blu-Icedata collection
PHENIXrefinement
XDSdata reduction
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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