Regional differences for the D-amino acid oxidase-catalysed oxidation of D-methionine in chicken small intestine.
1. Enzymic oxidation of D-[1-14C]methionine (D-met) to 2-keto-4-methylthiobutanoate (KMB) has been determined using 100,000 g supernatants prepared from chicken tissue homogenates. 2. The small intestinal mucosa contains substantial oxidative activity towards D-met, which represents about one-half and one-tenth the hepatic and renal activity, respectively. 3. KMB is poorly decarboxylated and rather transaminated to L-met. 4. The specific activity for D-met oxidation in the duodenal mucosa is 1.5- and 4.0-fold than in the jejunal and ileal mucosa, respectively. 5. The intestinal D-met-oxidizing activity is dramatically altered by the D-amino acid oxidase specific inhibitor benzoate.
I.N.R.A., Faculté des Sciences Pharmaceutiques et Biologiques, Paris, France.
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Brachet
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Puigserver
D000818:Animals; D002384:Catalysis; D002645:Chickens; D003605:D-Amino-Acid Oxidase / Q000378:metabolism*; D004386:Duodenum / Q000378:metabolism; D007413:Intestinal Mucosa / Q000378:metabolism; D007421:Intestine, Small / Q000378:metabolism*; D007583:Jejunum / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008715:Methionine / Q000378:metabolism*; D010084:Oxidation-Reduction
D008715:Methionine; D003605:D-Amino-Acid Oxidase