Crystal structure of the mycothiol-dependent maleylpyruvate isomerase H52A mutant

Experimental Data Snapshot

  • Resolution: 2.05 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.200 

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Crystal Structures and Site-directed Mutagenesis of a Mycothiol-dependent Enzyme Reveal a Novel Folding and Molecular Basis for Mycothiol-mediated Maleylpyruvate Isomerization

Wang, R.Yin, Y.J.Wang, F.Li, M.Feng, J.Zhang, H.M.Zhang, J.P.Liu, S.J.Chang, W.R.

(2007) J Biol Chem 282: 16288-16294

  • DOI: https://doi.org/10.1074/jbc.M610347200
  • Primary Citation of Related Structures:  
    2NSF, 2NSG

  • PubMed Abstract: 

    Mycothiol (MSH) is the major low molecular mass thiols in many Gram-positive bacteria such as Mycobacterium tuberculosis and Corynebacterium glutamicum. The physiological roles of MSH are believed to be equivalent to those of GSH in Gram-negative bacteria, but current knowledge of MSH is limited to detoxification of alkalating chemicals and protection from host cell defense/killing systems. Recently, an MSH-dependent maleylpyruvate isomerase (MDMPI) was discovered from C. glutamicum, and this isomerase represents one example of many putative MSH-dependent enzymes that take MSH as cofactor. In this report, fourteen mutants of MDMPI were generated. The wild type and mutant (H52A) MDMPIs were crystallized and their structures were solved at 1.75 and 2.05 A resolution, respectively. The crystal structures reveal that this enzyme contains a divalent metal-binding domain and a C-terminal domain possessing a novel folding pattern (alphabetaalphabetabetaalpha fold). The divalent metal-binding site is composed of residues His52, Glu144, and His148 and is located at the bottom of a surface pocket. Combining the structural and site-directed mutagenesis studies, it is proposed that this surface pocket including the metal ion and MSH moiety formed the putative catalytic center.

  • Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hypothetical protein Cgl3021261Corynebacterium glutamicumMutation(s): 1 
Find proteins for Q8NLC1 (Corynebacterium glutamicum (strain ATCC 13032 / DSM 20300 / BCRC 11384 / JCM 1318 / LMG 3730 / NCIMB 10025))
Explore Q8NLC1 
Go to UniProtKB:  Q8NLC1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NLC1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.05 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.200 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.63α = 90
b = 66.63β = 90
c = 129.42γ = 120
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
CrystalCleardata collection
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-04-10
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations