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  • Title: Excessive urinary excretion of methionine in mutant mice lacking D-amino-acid oxidase activity.
    Author: Konno R, Isobe K, Niwa A, Yasumura Y.
    Journal: Metabolism; 1988 Dec; 37(12):1139-42. PubMed ID: 2904113.
    Abstract:
    Thin-layer chromatography and amino acid analysis showed that mutant (ddY/DAO-) mice lacking D-amino-acid oxidase activity excreted about 3.5 times more methionine in urine than did normal (ddY/DAO+) mice. High-performance liquid chromatography using a chiral column showed that approximately 82% of urinary methionine of the ddY/DAO- mice had the D-configuration. Analysis revealed that the mouse diet used contained 0.04% free methionine and that approximately 46% of methionine was the D-isomer. When the ddY/DAO- mice were given a diet containing a low level of supplementary DL-methionine or a diet without D-methionine, they excreted the normal levels of methionine. These results indicate that the ddY/DAO- mice were unable to metabolize D-methionine and excrete it in urine.
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