2LQQ

Oxidized Mrx1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mycoredoxin-1 is one of the missing links in the oxidative stress defence mechanism of Mycobacteria.

Van Laer, K.Buts, L.Foloppe, N.Vertommen, D.Van Belle, K.Wahni, K.Roos, G.Nilsson, L.Mateos, L.M.Rawat, M.van Nuland, N.A.Messens, J.

(2012) Mol.Microbiol. 86: 787-804

  • DOI: 10.1111/mmi.12030
  • Primary Citation of Related Structures:  2LQO

  • PubMed Abstract: 
  • To survive hostile conditions, the bacterial pathogen Mycobacterium tuberculosis produces millimolar concentrations of mycothiol as a redox buffer against oxidative stress. The reductases that couple the reducing power of mycothiol to redox active pr ...

    To survive hostile conditions, the bacterial pathogen Mycobacterium tuberculosis produces millimolar concentrations of mycothiol as a redox buffer against oxidative stress. The reductases that couple the reducing power of mycothiol to redox active proteins in the cell are not known. We report a novel mycothiol-dependent reductase (mycoredoxin-1) with a CGYC catalytic motif. With mycoredoxin-1 and mycothiol deletion strains of Mycobacterium smegmatis, we show that mycoredoxin-1 and mycothiol are involved in the protection against oxidative stress. Mycoredoxin-1 acts as an oxidoreductase exclusively linked to the mycothiol electron transfer pathway and it can reduce S-mycothiolated mixed disulphides. Moreover, we solved the solution structures of oxidized and reduced mycoredoxin-1, revealing a thioredoxin fold with a putative mycothiol-binding site. With HSQC snapshots during electron transport, we visualize the reduction of oxidized mycoredoxin-1 as a function of time and find that mycoredoxin-1 gets S-mycothiolated on its N-terminal nucleophilic cysteine. Mycoredoxin-1 has a redox potential of -218 mV and hydrogen bonding with neighbouring residues lowers the pKa of its N-terminal nucleophilic cysteine. Determination of the oxidized and reduced structures of mycoredoxin-1, better understanding of mycothiol-dependent reactions in general, will likely give new insights in how M. tuberculosis survives oxidative stress in human macrophages.


    Organizational Affiliation

    Department of Structural Biology, Vlaams Instituut voor Biotechnologie, Brussels, 1050, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative glutaredoxin Rv3198.1/MT3292
A
92Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)EC: 1.-.-.-
Find proteins for P9WN17 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WN17
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2LQQ Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-10-10
    Type: Initial release
  • Version 1.1: 2013-01-30
    Type: Database references
  • Version 1.2: 2013-03-06
    Type: Database references