2WVJ

Mutation of Thr163 to Ser in Human Thymidine Kinase Shifts the Specificity from Thymidine towards the Nucleoside Analogue Azidothymidine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.176 

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This is version 1.2 of the entry. See complete history


Literature

Comparative Active-Site Mutation Study of Human and Caenorhabditis Elegans Thymidine Kinase 1.

Skovgaard, T.Uhlin, U.Munch-Petersen, B.

(2012) FEBS J 279: 1777

  • DOI: 10.1111/j.1742-4658.2012.08554.x
  • Primary Citation of Related Structures:  
    2WVJ

  • PubMed Abstract: 
  • The first step for the intracellular retention of several anticancer or antiviral nucleoside analogues is the addition of a phosphate group catalysed by a deoxyribonucleoside kinase such as thymidine kinase 1 (TK1). Recently, human TK1 (HuTK1) has been c ...

    The first step for the intracellular retention of several anticancer or antiviral nucleoside analogues is the addition of a phosphate group catalysed by a deoxyribonucleoside kinase such as thymidine kinase 1 (TK1). Recently, human TK1 (HuTK1) has been crystallized and characterized using different ligands. To improve our understanding of TK1 substrate specificity, we performed a detailed, mutation-based comparative structure-function study of the active sites of two thymidine kinases: HuTK1 and Caenorhabditis elegans TK1 (CeTK1). Specifically, mutations were introduced into the hydrophobic pocket surrounding the substrate base. In CeTK1, some of these mutations led to increased activity with deoxycytidine and deoxyguanosine, two unusual substrates for TK1-like kinases. In HuTK1, mutation of T163 to S resulted in a kinase with a 140-fold lower K(m) for the antiviral nucleoside analogue 3'-azido-3'-deoxythymidine (AZT) compared with the natural substrate thymidine. The crystal structure of the T163S-mutated HuTK1 reveals a less ordered conformation of the ligand thymidine triphosphate compared with the wild-type structure but the cause of the changed specificity towards AZT is not obvious. Based on its highly increased AZT activity relative to thymidine activity this TK1 mutant could be suitable for suicide gene therapy.


    Organizational Affiliation

    Department of Science, Systems and Models, Roskilde University, Denmark. tine.skovgaard@cpr.ku.dk



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THYMIDINE KINASE, CYTOSOLIC ABCDEFGH193Homo sapiensMutation(s): 1 
Gene Names: TK1
EC: 2.7.1.21
Find proteins for P04183 (Homo sapiens)
Explore P04183 
Go to UniProtKB:  P04183
NIH Common Fund Data Resources
PHAROS:  P04183
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.176 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 156.902α = 90
b = 123.252β = 132.98
c = 121.024γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2012-05-02
    Changes: Database references, Derived calculations, Version format compliance
  • Version 1.2: 2019-05-08
    Changes: Data collection, Experimental preparation, Other