4KPG

Crystal structure of MycP1 from the ESX-1 type VII secretion system


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.148 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Mycosin-1 Protease from the Mycobacterial ESX-1 Protein Type VII Secretion System.

Solomonson, M.Huesgen, P.F.Wasney, G.A.Watanabe, N.Gruninger, R.J.Prehna, G.Overall, C.M.Strynadka, N.C.

(2013) J.Biol.Chem. 288: 17782-17790

  • DOI: 10.1074/jbc.M113.462036
  • Primary Citation of Related Structures:  4J94

  • PubMed Abstract: 
  • Mycobacteria use specialized type VII (ESX) secretion systems to export proteins across their complex cell walls. Mycobacterium tuberculosis encodes five nonredundant ESX secretion systems, with ESX-1 being particularly important to disease progressi ...

    Mycobacteria use specialized type VII (ESX) secretion systems to export proteins across their complex cell walls. Mycobacterium tuberculosis encodes five nonredundant ESX secretion systems, with ESX-1 being particularly important to disease progression. All ESX loci encode extracellular membrane-bound proteases called mycosins (MycP) that are essential to secretion and have been shown to be involved in processing of type VII-exported proteins. Here, we report the first x-ray crystallographic structure of MycP1(24-407) to 1.86 Å, defining a subtilisin-like fold with a unique N-terminal extension previously proposed to function as a propeptide for regulation of enzyme activity. The structure reveals that this N-terminal extension shows no structural similarity to previously characterized protease propeptides and instead wraps intimately around the catalytic domain where, tethered by a disulfide bond, it forms additional interactions with a unique extended loop that protrudes from the catalytic core. We also show MycP1 cleaves the ESX-1 secreted protein EspB from both M. tuberculosis and Mycobacterium smegmatis at a homologous cut site in vitro.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology and Centre for Blood Research, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Membrane-anchored mycosin mycp1
A
404Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155)N/A
Find proteins for A0QNL1 (Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155))
Go to UniProtKB:  A0QNL1
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: 2.148 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.166 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 81.000α = 90.00
b = 94.080β = 90.00
c = 119.600γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-22
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Database references
  • Version 1.2: 2013-07-03
    Type: Database references