1Q7T

Rv1170 (MshB) from Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of MshB from Mycobacterium tuberculosis, a Deacetylase Involved in Mycothiol Biosynthesis.

McCarthy, A.A.Peterson, N.A.Knijff, R.Baker, E.N.

(2004) J.Mol.Biol. 335: 1131-1141


  • PubMed Abstract: 
  • All living species require protection against the damaging effects of the reactive oxygen species that are a natural by-product of aerobic life. In most organisms, glutathione is a critical component of these defences, maintaining a reducing environm ...

    All living species require protection against the damaging effects of the reactive oxygen species that are a natural by-product of aerobic life. In most organisms, glutathione is a critical component of these defences, maintaining a reducing environment inside cells. Some bacteria, however, including pathogenic mycobacteria, use an alternative low molecular mass thiol compound called mycothiol (MSH) for this purpose. Enzymes that synthesize MSH are attractive candidates for the design of novel anti-TB drugs because of the importance of MSH for mycobacterial life and the absence of such enzymes in humans. We have determined the three-dimensional structure of MshB (Rv1170), a metal-dependent deacetylase from Mycobacterium tuberculosis that catalyses the second step in MSH biosynthesis. The structure, determined at 1.9A resolution by X-ray crystallography (R=19.0%, R(free)=21.4%), reveals an alpha/beta fold in which helices pack against a seven-stranded mostly parallel beta-sheet. Large loops emanating from the C termini of the beta-strands enclose a deep cavity, which is the location of the putative active site. At the bottom of this cavity is a metal-binding site associated with a sequence motif AHPDDE that is invariant in all homologues. An adventitiously bound beta-octylglucoside molecule, used in crystallization, enables us to model the binding of the true substrate and propose a metal-dependent mechanistic model for deacetylation. Sequence comparisons indicate that MshB is representative of a wider family of enzymes that act on substituted N-acetylglucosamine residues, including a deacetylase involved in the biosynthesis of glycosylphosphatidylinositol (GPI) anchors in eukaryotes.


    Organizational Affiliation

    School of Biological Sciences, University of Auckland, Private Bag 92-019, 1, Auckland, New Zealand




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
hypothetical protein Rv1170
A, B
328Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: mshB
EC: 3.5.1.103
Find proteins for P9WJN3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WJN3
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
BOG
Query on BOG

Download SDF File 
Download CCD File 
A, B
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 71.690α = 90.00
b = 83.740β = 90.00
c = 95.650γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
XDSdata scaling
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-01-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance