1W2G

Crystal Structure Of Mycobacterium Tuberculosis Thymidylate Kinase Complexed With Deoxythymidine (dT) (2.1 A Resolution)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 

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This is version 1.3 of the entry. See complete history. 


Literature

The Crystal Structure of Mycobacterium Tuberculosis Thymidylate Kinase in Complex with 3'-Azidodeoxythymidine Monophosphate Suggests a Mechanism for Competitive Inhibition

Fioravanti, E., Adam, V., Munier-Lehmann, H., Bourgeois, D.

(2005) Biochemistry 44: 130

  • DOI: 10.1021/bi0484163
  • Primary Citation of Related Structures:  
    1W2H, 1W2G

  • PubMed Abstract: 

    • Tuberculosis (TB) is the primary cause of mortality among infectious diseases. Mycobacterium tuberculosis thymidylate kinase (TMPK(Mtub)) catalyzes the ATP-dependent phosphorylation of deoxythymidine 5'-monophosphate (dTMP). Essential to DNA replicat ...

    Tuberculosis (TB) is the primary cause of mortality among infectious diseases. Mycobacterium tuberculosis thymidylate kinase (TMPK(Mtub)) catalyzes the ATP-dependent phosphorylation of deoxythymidine 5'-monophosphate (dTMP). Essential to DNA replication, this enzyme represents a promising target for developing new drugs against TB, because the configuration of its active site is unique within the TMPK family. Indeed, it has been proposed that, as opposed to other TMPKs, catalysis by TMPK(Mtub) necessitates the transient binding of a magnesium ion coordinating the phosphate acceptor. Moreover, 3'-azidodeoxythymidine monophosphate (AZTMP) is a competitive inhibitor of TMPK(Mtub), whereas it is a substrate for human and other TMPKs. Here, the crystal structures of TMPK(Mtub) in complex with deoxythymidine (dT) and AZTMP were determined to 2.1 and 2.0 A resolution, respectively, and suggest a mechanism for inhibition. The azido group of AZTMP perturbs the induced-fit mechanism normally adopted by the enzyme. Magnesium is prevented from binding, and the resulting electrostatic environment precludes phosphoryl transfer from occurring. Our data provide a model for drug development against tuberculosis.

    Organizational Affiliation: 

    LCCP, UMR 5075, IBS-CEA/CNRS/UJF, 41 avenue Jules Horowitz, 38027 Grenoble Cedex 1, France.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THYMIDYLATE KINASE TMKA, B214Mycobacterium tuberculosisMutation(s): 0 
EC: 2.7.4.9
Find proteins for P9WKE1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WKE1 
Go to UniProtKB:  P9WKE1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
THM
Query on THM
Download CCD File 
A, B
THYMIDINE
C10 H14 N2 O5
IQFYYKKMVGJFEH-XLPZGREQSA-N		 Ligand Interaction
ACT
Query on ACT
Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M		 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
THMKi:  715000   nM  BindingDB
THMKi :  27000   nM  PDBBind
THMKi:  27000   nM  BindingDB
THMKi:  27000   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.211 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.865α = 90
b = 63.865β = 90
c = 195.336γ = 120
Software Package:
Software NamePurpose
CNSrefinement
MOSFLMdata reduction
SCALAdata scaling
CNSphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-01-12
    Type: Initial release
  • Version 1.1: 2011-06-02
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-05-02
    Changes: Data collection