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Updated: May 3, 2026

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization
Published on: April 3, 2014
Inhibition of human thymidine phosphorylase by conformationally constrained pyrimidine nucleoside phosphonic acids
Ivana Košiová1, Ondřej Šimák1, Natalya Panova1
1Institute of Organic Chemistry and Biochemistry, Academy of Sciences v. v. i., Flemingovo 2, 166 10 Prague 6, Czech Republic.
Abstract:
A series of conformationally constrained uridine-based nucleoside phosphonic acids containing annealed 1,3-dioxolane and 1,4-dioxane rings and their "open-structure" isosteres were synthesized and evaluated as potential multisubstrate-like inhibitors of the human recombinant thymidine phosphorylase (TP, EC 2.4.2.4) and TP obtained from peripheral blood mononuclear cells (PBMC). From a large set of tested nucleoside phosphonic acids, several potent compounds were identified that exhibited Ki values in the range of 0.048-1 μM. The inhibition potency of the studied compounds strongly depended on the degree of conformational flexibility of the phosphonate moiety, the stereochemical arrangement of the sugar-phosphonate component, and the substituent at position 5 of the pyrimidine nucleobase.
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