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- W1529014746 abstract "Publisher Summary This chapter discusses riboflavin synthetase obtained from Erernothecium ashbyii and a salvage pathway of the by-product in the enzyme reaction. In the pathway of riboflavin biosynthesis, purine with the exception of C-8 is incorporated into the isoalloxazine ring of riboflavin. Studies, with a guanine analog, 8-azaguanine and labeled purines in Eremothecium ashbyii, have revealed that the guanosine nucleotides, guanosine triphosphate (GTP) is the most immediate nucleotide precursor of riboflavin. An intermediate positioned after GTP in the biosynthetic pathway is believed to be 4-ribitylamino-2,5-diamino-6-hydroxypyrimidine, isolated from riboflavin-deficient mutants of yeast. Another intermediate, the nearest precursor to 6,7-dimethyl-8-ribityllumazine, was isolated from E. ashbyii and the mutants of yeast and Bacillus subtilis , and was identified as 4-ribitylamino-5-amino-2,6-dihydroxypyrimidine that reacts with the 4-carbon compound to form the lumazine. The pyrimidine is structurally identical to the by-product in the riboflavin synthetase reaction, in which 2 mol of 6,7-dimethyl-8-ribityllumazine are consumed to form 1 mol of riboflavin and 1 mol of the by-product. The by-product was expected to be reutilized for the in vivo synthesis of riboflavin through the supplementation of the suitable 4-carbon compound to form 6,7-dimethyl-8-ribityllumazine. The experiments, with the riboflavin synthetase from E. ashbyii and a 4-carbon compound, diacetyl, present supporting evidence for the possibility." @default.
- W1529014746 created "2016-06-24" @default.
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- W1529014746 date "1980-01-01" @default.
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- W1529014746 title "[44] Riboflavin synthetase from Eremothecium ashbyii and a salvage pathway of the by-product in the enzyme reaction" @default.
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- W1529014746 doi "https://doi.org/10.1016/0076-6879(80)66474-x" @default.
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