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The capacity of recombinant human cytosolic thymidine kinase (TK1) and bovine mitochondrial thymidine kinase (TK2) to phosphorylate the antiviral analogs 1-(2'-deoxy-2'-fluoro-1-beta-D-arabinofuranosyl)-5-iodouracil (FIAU) and 1-(2'-deoxy-2'-fluoro-1-beta-D-arabinofuranosyl)-5-methyluracil (FMAU) has been analyzed. The Vmax/Km ratios for FIAU and FMAU with TK2 are about 30% of that for deoxythymidine, while the corresponding values for TK1 are 2 and 5%, respectively. Thus, these two analogs are more efficient substrates for TK2 than for TK1, which may be part of the explanation for the mitochondrial toxicity associated with FIAU during treatment of hepatitis B infection.

antimicrobial agents and chemotherapy

Phosphorylation of the anti-hepatitis B nucleoside analog 1-(2'-deoxy-2'-fluoro-1-beta-D-arabinofuranosyl)-5-iodouracil (FIAU) by human cytosolic and mitochondrial thymidine kinase and implications for cytotoxicity