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Overview
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5-Fluorocytosine (syn. Flucytosine) is a fluorinated cytosine (pyrimidine) analog with antifungal activity. First developed in 1957, it is active against Candida and Cryptococcus and is a competitive inhibitor of uracil metabolism. 5-Fluorocytosine is taken up by the fungus and is converted to the cytostatic 5-fluorouracil by cytosine deaminase. 5-Fluorocytosine can also be used in brain tumor research models using the virus Toca 511 which codes for cytosine deaminase. 5-Fluorocytosine is sparingly soluble in water.
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Background
5-Fluorocytosine is taken up by the fungus and is deaminated by cytosine deaminase (CD) and converted to the cytostatic 5-fluorouracil (5-FU). During transcription, the pyrimidine analog is incorporated into the RNA which inhibits subsequent rounds of transcription and building of certain essential proteins.
An additional mechanism of action involves the conversion of 5-Fluorocytosine to 5-fluorodeoxyuridinemonophosphate, which inhibits fungal DNA synthesis.
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- Properties
- Applications
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Overview