Abstract
Induction of the d-amino acid oxidase (EC. 1.4.3.3) from the yeast Trigonopsis variabilis was investigated by using a minimal medium containing glucose as the carbon and energy source, (NH(inf4))(inf2)SO(inf4) as the nitrogen source, and various d- and dl-amino acid derivatives as inducers. The best new inducers found were N-carbamoyl-d-alanine, N-acetyl-d-tryptophan, and N-chloroacetyl-d-(alpha)-aminobutyric acid; when the induction effects of these compounds were compared with the effects of d-alanine as the nitrogen source and inducer, the resulting activities of d-amino acid oxidase per gram of dried yeast were 4.2, 2.1, and 1.5 times higher, respectively. The optimum concentration of the best inducer, N-carbamoyl-d-alanine, was 5 mM. This inducer could also be used in its racemic form. The induction was pH dependent. After cultivation of the yeast in a 50-liter bioreactor, d-amino acid oxidase activity of about 3,850 (mu)kat (231,000 U) was obtained. In addition, production of the d-amino acid oxidase was found to be significantly dependent on the metal salt composition of the medium. Addition of zinc ions was required to obtain high d-amino acid oxidase levels in the cells. The optimum concentration of ZnSO(inf4) was about 140 (mu)M.
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