4QE3

Crystal structure of Antigen 85C-H260Q mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.351 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1074/jbc.M114.582445
  • Primary Citation of Related Structures:  

  • 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 8 ...

    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.,From the Department of Chemistry and Biochemistry, University of Toledo, Toledo, Ohio 43606-3390 donald.ronning@utoledo.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Diacylglycerol acyltransferase/mycolyltransferase Ag85C
A
302Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 1 
Gene Names: fbpC (mpt45)
EC: 2.3.1.122, 2.3.1.20
Find proteins for P9WQN9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WQN9
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1N7
Query on 1N7

Download SDF File 
Download CCD File 
A
CHAPSO
2-hydroxy-N,N-dimethyl-3-sulfo-N-(3-{[(3beta,5beta,7beta,12beta)-3,7,12-trihydroxy-24-oxocholan-24-yl]amino}propyl)propan-1-aminium
C32 H59 N2 O8 S
GUQQBLRVXOUDTN-XOHPMCGNSA-O
 Ligand Interaction
ACY
Query on ACY

Download SDF File 
Download CCD File 
A
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.351 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 60.725α = 90.00
b = 68.128β = 90.00
c = 76.307γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
EPMRphasing
HKL-2000data collection
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-09
    Type: Initial release
  • Version 1.1: 2014-07-30
    Type: Database references
  • Version 1.2: 2014-09-24
    Type: Database references