1N8W

Biochemical and Structural Studies of Malate Synthase from Mycobacterium tuberculosis

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.200 

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This is version 1.2 of the entry. See complete history. 


Literature

Biochemical and structural studies of malate synthase from Mycobacterium tuberculosis

Smith, C.V., Huang, C.C., Miczak, A., Russell, D.G., Sacchettini, J.C., Honer Zu Bentrup, K.

(2003) J Biol Chem 278: 1735-1743

  • DOI: 10.1074/jbc.M209248200
  • Primary Citation of Related Structures:  
    1N8W, 1N8I

  • PubMed Abstract: 

    • Establishment or maintenance of a persistent infection by Mycobacterium tuberculosis requires the glyoxylate pathway. This is a bypass of the tricarboxylic acid cycle in which isocitrate lyase and malate synthase (GlcB) catalyze the net incorporation of carbon during growth of microorganisms on acetate or fatty acids as the primary carbon source ...

    Establishment or maintenance of a persistent infection by Mycobacterium tuberculosis requires the glyoxylate pathway. This is a bypass of the tricarboxylic acid cycle in which isocitrate lyase and malate synthase (GlcB) catalyze the net incorporation of carbon during growth of microorganisms on acetate or fatty acids as the primary carbon source. The glcB gene from M. tuberculosis, which encodes malate synthase, was cloned, and GlcB was expressed in Escherichia coli. The influence of media conditions on expression in M. tuberculosis indicated that this enzyme is regulated differentially to isocitrate lyase. Purified GlcB had K(m) values of 57 and 30 microm for its substrates glyoxylate and acetyl coenzyme A, respectively, and was inhibited by bromopyruvate, oxalate, and phosphoenolpyruvate. The GlcB structure was solved to 2.1-A resolution in the presence of glyoxylate and magnesium. We also report the structure of GlcB in complex with the products of the reaction, coenzyme A and malate, solved to 2.7-A resolution. Coenzyme A binds in a bent conformation, and the details of its interactions are described, together with implications on the enzyme mechanism.

    Organizational Affiliation: 

    Department of Biochemistry and Biophysics, Texas A & M University, College Station, Texas 77843-2128, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Probable malate synthase G A, B741Mycobacterium tuberculosisMutation(s): 0 
Gene Names: glcB
EC: 4.1.3.2 (PDB Primary Data), 2.3.3.9 (UniProt)
Find proteins for P9WK17 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WK17 
Go to UniProtKB:  P9WK17
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.200 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.985α = 90
b = 120.985β = 90
c = 232.787γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-12-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance