Abstract
The regulatory properties of chorismate mutase, its cellular localization and isoenzyme pattern were investigated in 23 yeast species. All yeasts contained only a single form of the enzyme, which is localized exclusively in the cytosol. The enzyme activity from all sources was activated 3-(Rhodotorula aurantiaca) to 185-fold (Candida maltosa) by tryptophan. The tryphtophan concentration, which was necessary to obtain half maximum velocity was determined to be between 2 (Pichia guilliermondii) and 95 μM (Yarrowia lipolytica). Ten yeast species possessed an enzyme that was inhibited by both phenylalanine and tyrosine. The chorismate mutase from four strains was inhibited only by tyrosine and the enzyme from two species was inhibited by phenylalanine alone. The enzyme inhibition by phenylalanine and tyrosine was completely reversed by tryptophan. Six enzyme sources were not inhibited and theY. lipolytica chorismate mutase was slightly activated by both amino acids.
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Bode, R., Birnbaum, D. Regulation of chorismate mutase activity of various yeast species by aromatic amino acids. Antonie van Leeuwenhoek 59, 9–13 (1991). https://doi.org/10.1007/BF00582113
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DOI: https://doi.org/10.1007/BF00582113