Transaminase and D-Amino Acid Oxidase of Trigonopsis variabilis

Abstract
The yeast Trigonopsis variabilis can utilize many single amino acids as sole source of nitrogen. Of the amino acids utilized, the D-isomers are oxidatively deaminated, whilst the L-isomers are transaminated with either [alpha]-ketoglutarate or pyruvate. The D-amino acid oxidase activity of this organism, when grown on DL-methionine as sole source of nitrogen, is the highest yet recorded, and may be recommended for the preparation of keto acids.