4QEK

Crystal structure of Antigen 85C-S124A mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.143 
  • R-Value Work: 0.127 
  • R-Value Observed: 0.127 

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This is version 1.4 of the entry. See complete history


Literature

Inactivation of the Mycobacterium tuberculosis Antigen 85 Complex by Covalent, Allosteric Inhibitors.

Favrot, L.Lajiness, D.H.Ronning, D.R.

(2014) J Biol Chem 289: 25031-25040

  • DOI: https://doi.org/10.1074/jbc.M114.582445
  • Primary Citation of Related Structures:  
    4QDO, 4QDT, 4QDU, 4QDX, 4QDZ, 4QE3, 4QEK

  • PubMed Abstract: 

    The rise of multidrug-resistant and totally drug-resistant tuberculosis and the association with an increasing number of HIV-positive patients developing tuberculosis emphasize the necessity to find new antitubercular targets and drugs. The antigen 85 (Ag85) complex from Mycobacterium tuberculosis plays important roles in the biosynthesis of major components of the mycobacterial cell envelope. For this reason, Ag85 has emerged as an attractive drug target. Recently, ebselen was identified as an effective inhibitor of the Ag85 complex through covalent modification of a cysteine residue proximal to the Ag85 active site and is therefore a covalent, allosteric inhibitor. To expand the understanding of this process, we have solved the x-ray crystal structures of Ag85C covalently modified with ebselen and other thiol-reactive compounds, p-chloromercuribenzoic acid and iodoacetamide, as well as the structure of a cysteine to glycine mutant. All four structures confirm that chemical modification or mutation at this particular cysteine residue leads to the disruption of the active site hydrogen-bonded network essential for Ag85 catalysis. We also describe x-ray crystal structures of Ag85C single mutants within the catalytic triad and show that a mutation of any one of these three residues promotes the same conformational change observed in the cysteine-modified forms. These results provide evidence for active site dynamics that may afford new strategies for the development of selective and potent Ag85 inhibitors.


  • Organizational Affiliation

    From the Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio 43606-3390.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Diacylglycerol acyltransferase/mycolyltransferase Ag85C301Mycobacterium tuberculosis H37RvMutation(s): 1 
Gene Names: fbpCmpt45MTCI5.03cRv0129c
EC: 2.3.1.122 (PDB Primary Data), 2.3.1.20 (PDB Primary Data)
UniProt
Find proteins for P9WQN9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WQN9 
Go to UniProtKB:  P9WQN9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WQN9
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.143 
  • R-Value Work: 0.127 
  • R-Value Observed: 0.127 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 136.736α = 90
b = 67.859β = 94.36
c = 35.692γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
EPMRphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-07-30
    Changes: Database references
  • Version 1.2: 2014-09-24
    Changes: Database references
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Database references, Derived calculations, Structure summary
  • Version 1.4: 2024-02-28
    Changes: Data collection, Database references, Structure summary