1GSI

CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS THYMIDYLATE KINASE COMPLEXED WITH THYMIDINE MONOPHOSPHATE (TMP)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

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This is version 1.2 of the entry. See complete history


Literature

Cryophotolysis of Caged Compounds: A Technique for Trapping Intermediate States in Protein Crystals

Ursby, T.Weik, M.Fioravanti, E.Delarue, M.Goeldner, M.Bourgeois, D.

(2002) Acta Crystallogr D Biol Crystallogr 58: 607

  • DOI: 10.1107/s0907444902002135
  • Primary Citation of Related Structures:  
    1GSI, 1GTV

  • PubMed Abstract: 
  • Caged compounds in combination with protein crystallography represent a valuable tool in studies of enzyme reaction intermediates. To date, photochemical triggering of reactions has been performed close to room temperature. Synchronous reaction initiation has only been achieved with enzymes of relatively slow turnover (<0 ...

    Caged compounds in combination with protein crystallography represent a valuable tool in studies of enzyme reaction intermediates. To date, photochemical triggering of reactions has been performed close to room temperature. Synchronous reaction initiation has only been achieved with enzymes of relatively slow turnover (<0.1 s(-1)) and caged compounds of high quantum yield. Here X-ray crystallography and microspectrophotometry were used to provide evidence that (nitrophenyl)ethyl (NPE) ester bonds can be photolyzed by UV light at cryotemperatures. NPE-caged ATP in flash-cooled crystals of Mycobacterium tuberculosis thymidylate kinase was photolyzed successfully at 100-150 K as assessed by the structural observation of ATP-dependent enzymatic conversion of TMP to TDP after temporarily warming the crystals to room temperature. A new method is proposed in which cryo-photolysis combined with temperature-controlled protein crystallography can be used to trap reaction intermediates even in some of the fastest enzymes and/or when only compounds of low quantum yield are available. Raising the temperature after cryophotolysis may allow a transition barrier to be passed and an intermediate to accumulate in the crystal. A comparable method has only been used so far with proteins displaying endogenous photosensitivity. The approach described here opens the way to studying the reaction mechanisms of a much larger number of crystalline enzymes. Furthermore, it is shown that X-ray-induced radiolysis of caged compounds occurs if high-intensity synchrotron beamlines are used. This caveat should be taken into account when deriving data-collection protocols. It could also be used potentially as a way to trigger reactions.


    Related Citations: 
    • X-Ray Structure of Tmp Kinase from Mycobacterium Tuberculosis Complexed with Tmp at 1.95 A Resolution
      De La Sierra Li, I., Munier-Lehmann, H., Gilles, A.M., Barzu, O., Delarue, M.
      (2001) J Mol Biol 311: 87
    • Crystallization and Preliminary X-Ray Analysis of the Thymidylate Kinase from Mycobacterium Tuberculosis
      De La Sierra Li, I., Munier-Lehmann, H., Gilles, A.M., Barzu, O., Delarue, M.
      (2000) Acta Crystallogr D Biol Crystallogr D56: 226

    Organizational Affiliation

    LCCP, UMR 9015, Institut de Biologie Structurale, 41 Avenue Jules Horowitz, 38027 Grenoble CEDEX 1, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THYMIDYLATE KINASEA214Mycobacterium tuberculosisMutation(s): 0 
EC: 2.7.4.9
UniProt
Find proteins for P9WKE1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WKE1 
Go to UniProtKB:  P9WKE1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WKE1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.225α = 90
b = 76.225β = 90
c = 134.264γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALAdata scaling
TRUNCATEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-28
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance