The high-resolution IR-spectra of 5-nitrouracil and 5-bromouracil isolated in Ar matrices at 11 K were obtained for the first time. The conformational structure of uracil 5-substituents--thymine, 5-bromouracil, 5-nitrouracil--is calculated by the molecular mechanics and quantum--chemical MINDO/3 methods. The possibility of
Several N-phenylhomophthalimide derivatives were prepared and their inhibitory activity on thymidine phosphorylase/ platelet-derived endothelial cell growth factor (TP/PD-ECGF) was assessed. Among them, 2-(2,6-diethylphenyl)-7-nitro-1,2,3,4-tetrahydroisoquinoline-1,3-dione (9) was found to be a more potent inhibitor than the classical inhibitor, 5-nitrouracil (1). Lineweaver-Burk plot
A few organisms, notably some fungi, have the ability to metabolize thymidine to uracil, thus conserving the pyrimidine ring for subsequent metabolic use. Neurospora crassa possesses this pathway, termed the thymidine salvage pathway, and can utilize thymidine as a total
tRNA in which uracil is completely replaced by 5-nitro-uracil was prepared by substituting 5-nitro-UTP for UTP in an in vitro transcription reaction. The rationale was that the 5-nitro substituent activates the 6-carbon of the Ura heterocycle towards nucleophiles, and hence
The degradation of 3H-thymidine under various cell culture conditions was analysed. It was found that a half of 3H-thymidine was degraded to 3H-thymine during 24 hours in PHA stimulation of blood lymphocytes. A control culture in which PHA was not
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