Abstract
The arginase and the ornithine transaminase of baker's yeast are induced byl-arginine. Both enzymes have been shown to be repressed by nitrogen compounds. This is evidenced primarily by the decrease in specific enzyme activities caused by the addition of readily assimilable nitrogen compounds to a yeast culture with arginine, secondly by the derepression of both enzymes during nitrogen starvation of the yeast grown in various arginine-free media. This derepression equals both in rate and in amount the enzyme synthesis during the adaptation of the yeast to a medium withl-arginine as the sole nitrogen source. It is inhibited by various assimilable and non-assimilable amino acids. The derepression is the result of the nitrogen deficiency itself, since during the starvation of the yeast for sulphate, phosphate or magnesium, neither of the two enzymes is derepressed, and since it is independent of the nature of the carbon source in the nitrogen starvation medium, provided the latter is immediately assimilable.
The enzymes are not subject to catabolite repression by glucose metabolites.
It is concluded that the synthesis of arginase and ornithine transaminase in yeast is regulated by induction and repression. Arginine induces the enzymes; they are repressed by nitrogen compounds, probably in cooperation with one or more vitamins.
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Thanks are due to Professor E. G. Mulder for his frequent encouragement, to the Heineken's Brouwerij, Rotterdam and to the Landbouwhogeschoolfonds for research grants, and to Miss H. P. M. Klinkers, to Mr. P. J. Buysman and to Mr. G. J. K. Pesch for their skilful technical assistance.
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Middelhoven, W.J. Induction and repression of arginase and ornithine transaminase in baker's yeast. Antonie van Leeuwenhoek 36, 1–19 (1970). https://doi.org/10.1007/BF02069003
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DOI: https://doi.org/10.1007/BF02069003