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  • Title: [Activity of the enzyme of the 2d step of flavinogenesis, 2,5-diamino-6-hydroxy-4-ribosylaminopyrimidine-5'-phosphate reductase, in Pichia guilliermondii yeasts].
    Author: Shavlovskiĭ GM, Logvinenko EM, Sibirnyĭ AA, Fedorovich DV, Zakal'skiĭ AE.
    Journal: Mikrobiologiia; 1981; 50(6):1008-11. PubMed ID: 7329350.
    Abstract:
    The activity of 2,5-diamino-6-hydroxy-4-ribosylaminopyrimidine-5'-phosphate reductase, an enzyme of the second step of flavinogenesis, was studied in the yeast Pichia guilliermondii using a new fluorimetric technique. The activity of the enzyme was found in extracts of the wild-type strain and the genotype rib mutants but not in extracts of the FM 1-4 (rib 2) mutant. Interallelic complementation was revealed in the gene rib 2. The activity of the enzyme was identical in extracts of the cells grown in the medium with either a high or a low iron content which synthesized riboflavin at a low or a high rate, respectively. Therefore, the synthesis of this enzyme in P. guilliermondii is not regulated with iron.
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