4RTD

Escherichia coli alpha-2-macroglobulin activated by porcine elastase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of protease-cleaved Escherichia coli alpha-2-macroglobulin reveals a putative mechanism of conformational activation for protease entrapment.

Fyfe, C.D.Grinter, R.Josts, I.Mosbahi, K.Roszak, A.W.Cogdell, R.J.Wall, D.M.Burchmore, R.J.Byron, O.Walker, D.

(2015) Acta Crystallogr.,Sect.D 71: 1478-1486

  • DOI: 10.1107/S1399004715008548

  • PubMed Abstract: 
  • Bacterial α-2-macroglobulins have been suggested to function in defence as broad-spectrum inhibitors of host proteases that breach the outer membrane. Here, the X-ray structure of protease-cleaved Escherichia coli α-2-macroglobulin is described, whic ...

    Bacterial α-2-macroglobulins have been suggested to function in defence as broad-spectrum inhibitors of host proteases that breach the outer membrane. Here, the X-ray structure of protease-cleaved Escherichia coli α-2-macroglobulin is described, which reveals a putative mechanism of activation and conformational change essential for protease inhibition. In this competitive mechanism, protease cleavage of the bait-region domain results in the untethering of an intrinsically disordered region of this domain which disrupts native interdomain interactions that maintain E. coli α-2-macroglobulin in the inactivated form. The resulting global conformational change results in entrapment of the protease and activation of the thioester bond that covalently links to the attacking protease. Owing to the similarity in structure and domain architecture of Escherichia coli α-2-macroglobulin and human α-2-macroglobulin, this protease-activation mechanism is likely to operate across the diverse members of this group.


    Organizational Affiliation

    Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, Scotland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized lipoprotein YfhM
A
1639Escherichia coli (strain K12)Mutation(s): 3 
Gene Names: yfhM
Find proteins for P76578 (Escherichia coli (strain K12))
Go to UniProtKB:  P76578
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.65 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.177 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 176.065α = 90.00
b = 176.065β = 90.00
c = 161.131γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
XDSdata reduction
AutoSolphasing
EDNAdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-15
    Type: Initial release
  • Version 1.1: 2015-07-29
    Type: Database references