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Table 1 Substrate specificity

From: Molecular characterization of equine thymidine kinase 1 and preliminary evaluation of its suitability as a serum biomarker for equine lymphoma

Substrate

Relative activity

dThd

100

Trifluorothymidine (TFT)

104.5

Azidothymidine (AZT)

55.0

Fluorothymidine (FLT)

43.5

α-dThd

<  0.01

Stavudine (D4T, 2′,3′.didehydro-2′,3′-dideoxythymidine)

6.4

dUrd

106.1

5-fluorodeoxyuridine (5FdU)

128.9

2′-deoxy-2′-fluoro-arabinofuranosyl-5-methyluracil (FMAU)

82.6

D-FMAU

96.2

L-FMAU

34.6

2′-deoxy-2′-fluoro-arabinofuranosyl-5-iodouracil (FIAU)

60.4

Uridine

1.7

Cytidine

<  0.01

dCyd

< 0.01

dAdo

< 0.01

dGuo

< 0.01

  1. The assay was performed using a coupled spectrophotometric method at 21 °C. The substrate concentration was 0.1 mM with 1 mM ATP as the phosphate donor. The data are given as a percentage of that with dThd (0.95 μmol/mg/min)