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- W1567756332 abstract "The experiments in this report involve the following series of reactions which were previously demonstrated with purified enzyme preparations from Neurospora crassa: thymidine a yields thymine ribonucleoside b yields thymine c yields 5-hydroxymethyluracil d yields 5-formyluracil e yields uracil-5-carboxylic acid f yields uracil. The evidence for some of the reactions occurring in vivo has been incomplete and for others totally lacking. In this paper intact cells of Neurospora are shown to be capable of converting the substrates of each of the reactions to the corresponding products. Studies are described which were carried out in vivo and in vitro with the pyrimidineless strains pyr-4,uc-1,uc-2 and pyr-4,uc-1,uc-3, developed by Williams and Mitchell. The results reported in the present paper indicate that (reaction a) and the uc-3 mutation affects thymine 7-hydroxylase (reactions c,d, and e). Evidence is presented for the 2'-hydroxylase reaction being the major, if not only, way by which Neurospora can initiate the conversion of thymidine to the pyrimidines of nucleic acids and for the 2'-hydroxylation of thymidine and deoxyuridine being catalyzed by the same enzyme. Deoxycytidine was shown not to be hydroxylated in intact cells but instead deaminated to deoxyuridine, which in turn was converted to uridine. Further studies with the uc-3-carrying strain showed that an enzyme other than thymine 7-hydroxylase can also convert 5-formyluracil to uracil-5-carboxylic acid." @default.
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- W1567756332 date "1975-02-01" @default.
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- W1567756332 title "Metabolism of pyrimidine deoxyribonucleosides in Neurospora crassa" @default.
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- W1567756332 doi "https://doi.org/10.1128/jb.121.2.648-655.1975" @default.
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