2GQ3

mycobacterium tuberculosis malate synthase in complex with magnesium, malate, and coenzyme A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.174 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

The product complex of M. tuberculosis malate synthase revisited.

Anstrom, D.M.Remington, S.J.

(2006) Protein Sci 15: 2002-2007

  • DOI: 10.1110/ps.062300206
  • Primary Citation of Related Structures:  
    2GQ3

  • PubMed Abstract: 
  • Enzymes of the glyoxylate shunt have been implicated as virulence factors in several pathogenic organisms, notably Mycobacterium tuberculosis and Candida albicans. Malate synthase has thus emerged as a promising target for design of anti-microbial agents ...

    Enzymes of the glyoxylate shunt have been implicated as virulence factors in several pathogenic organisms, notably Mycobacterium tuberculosis and Candida albicans. Malate synthase has thus emerged as a promising target for design of anti-microbial agents. For this effort, it is essential to have reliable models for enzyme:substrate complexes. A 2.7 Angstroms resolution crystal structure for M. tuberculosis malate synthase in the ternary complex with magnesium, malate, and coenzyme A has been previously described. However, some unusual aspects of malate and Mg(++) binding prompted an independent determination of the structure at 2.3 Angstroms resolution, in the presence of saturating concentrations of malate. The electron density map of the complex reveals the position and conformation of coenzyme A to be unchanged from that found in the previous study. However, the coordination of Mg(++) and orientation of bound malate within the active site are different. The revised position of bound malate is consistent with a reaction mechanism that does not require reorientation of the electrophilic substrate during the catalytic cycle, while the revised Mg(++) coordination is octahedral, as expected. The results should be useful in the design of malate synthase inhibitors.


    Organizational Affiliation

    Institute of Molecular Biology, Department of Chemistry, University of Oregon, Eugene, 97403, USA



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Malate synthase GA, B729Mycobacterium tuberculosisMutation(s): 0 
Gene Names: glcB
EC: 2.3.3.9
UniProt
Find proteins for P9WK17 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WK17 
Go to UniProtKB:  P9WK17
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WK17
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.174 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.38α = 90
b = 120.38β = 90
c = 238.889γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
EPMRphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-15
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description