XB-ART-47939Comp Biochem Physiol B Biochem Mol Biol October 1, 2013; 166 (2): 165-71.
D-Amino acid oxidase and presence of D-proline in Xenopus laevis.
We purified D-amino acid oxidase (EC 18.104.22.168, DAO) from Xenopus laevis tadpoles. The optimal temperature and pH for enzyme activity were 35-40 °C and 8.3-9.0, respectively, depending on the substrate amino acids available to the enzyme; the highest activity was observed with D-proline followed by D-phenylalanine. Activity was significantly inhibited by p-hydroxymercuribenzoate, but only moderately by p-chloromercuribenzoate or benzoate. Enzyme activity was increased until the final tadpole stage, but was reduced to one-third in the adult and was localized primarily in the kidney. The tadpoles contained high concentrations of D-proline close to the final developmental stage and nearly no D-amino acids were detected in the adult frog, indicating that D-amino acid oxidase functions in metamorphosis.
PubMed ID: 23994361
Article link: Comp Biochem Physiol B Biochem Mol Biol
Genes referenced: dao