3P24

Structure of profragilysin-3 from Bacteroides fragilis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 

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This is version 1.2 of the entry. See complete history


Literature

Structure, function and latency regulation of a bacterial enterotoxin potentially derived from a mammalian adamalysin/ADAM xenolog.

Goulas, T.Arolas, J.L.Gomis-Ruth, F.X.

(2011) Proc Natl Acad Sci U S A 108: 1856-1861

  • DOI: 10.1073/pnas.1012173108
  • Primary Citation of Related Structures:  
    3P24

  • PubMed Abstract: 
  • Enterotoxigenic Bacteroides fragilis is the most frequent disease-causing anaerobe in the intestinal tract of humans and livestock and its specific virulence factor is fragilysin, also known as B. fragilis toxin. This is a 21-kDa zinc-dependent metallope ...

    Enterotoxigenic Bacteroides fragilis is the most frequent disease-causing anaerobe in the intestinal tract of humans and livestock and its specific virulence factor is fragilysin, also known as B. fragilis toxin. This is a 21-kDa zinc-dependent metallopeptidase existing in three closely related isoforms that hydrolyze E-cadherin and contribute to secretory diarrhea, and possibly to inflammatory bowel disease and colorectal cancer. Here we studied the function and zymogenic structure of fragilysin-3 and found that its activity is repressed by a ∼170-residue prodomain, which is the largest hitherto structurally characterized for a metallopeptidase. This prodomain plays a role in both the latency and folding stability of the catalytic domain and it has no significant sequence similarity to any known protein. The prodomain adopts a novel fold and inhibits the protease domain via an aspartate-switch mechanism. The catalytic fragilysin-3 moiety is active against several protein substrates and its structure reveals a new family prototype within the metzincin clan of metallopeptidases. It shows high structural similarity despite negligible sequence identity to adamalysins/ADAMs, which have only been described in eukaryotes. Because no similar protein has been found outside enterotoxigenic B. fragilis, our findings support that fragilysins derived from a mammalian adamalysin/ADAM xenolog that was co-opted by B. fragilis through a rare case of horizontal gene transfer from a eukaryotic cell to a bacterial cell. Subsequently, this co-opted peptidase was provided with a unique chaperone and latency maintainer in the time course of evolution to render a robust and dedicated toxin to compromise the intestinal epithelium of mammalian hosts.


    Organizational Affiliation

    Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, Barcelona Science Park, Helix Building, E-08028 Barcelona, Spain.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BFT-3 ABCD397Bacteroides fragilisMutation(s): 0 
Gene Names: bft-3
EC: 3.4.24.74
Find proteins for O86049 (Bacteroides fragilis)
Explore O86049 
Go to UniProtKB:  O86049
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.170 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.74α = 90
b = 69.14β = 91.57
c = 158.91γ = 90
Software Package:
Software NamePurpose
ProDCdata collection
SHELXSphasing
REFMACrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description