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To assess the contributions of Tyr-55, Met-110 and His-217 in porcine kidney D-amino acid oxidase (EC 1.4.3.3, DAO) to its catalytic function, we constructed three mutant cDNAs coding for the enzymes possessing Phe-55, Leu-110 and Leu-217 by site-specific mutagenesis. The mutant and wild type cDNAs could be expressed in vitro with similar efficiency. The three mutant enzymes thus synthesized showed...
cDNA clones encoding D-amino acid oxidase were isolated from a human kidney cDNA library by hybridization with cDNA for the pig enzyme. The cDNA insert of 2.0 kilobase pairs long provided coding information for a protein consisting of 347 amino acids. The molecular mass of the enzyme was calculated to be 39 410 Da. The amino acid sequence similarity between the pig and human enzymes is 84.4%, and...
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