A spectrophotometric method for the determination of aminopeptidase activity with leucine dehydrogenase. 1983

S Takamiya, and T Ohshima, and K Tanizawa, and K Soda

L-Leucine dehydrogenase purified from Bacillus megaterium and Bacillus sphearicus was used for the determination of serum aminopeptidase activity with L-leucinamide as a substrate. L-Leucine produced by aminopeptidase was determined by measurement of the increase in absorbance at 340 nm caused by the formation of NADH. This method is useful for the kinetic studies of the aminopeptidase and the enzyme assay of a large number of samples. The serum aminopeptidase can be characterized to give some valuable information in clinical diagnosis by comparison of the results obtained by the present method with those by the conventional method with L-leucyl-p-nitroanilide as a substrate.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000594 Amino Acid Oxidoreductases A class of enzymes that catalyze oxidation-reduction reactions of amino acids. Acid Oxidoreductases, Amino,Oxidoreductases, Amino Acid
D000626 Aminopeptidases A subclass of EXOPEPTIDASES that act on the free N terminus end of a polypeptide liberating a single amino acid residue. EC 3.4.11. Aminopeptidase
D013056 Spectrophotometry, Ultraviolet Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Ultraviolet Spectrophotometry
D013379 Substrate Specificity A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts. Specificities, Substrate,Specificity, Substrate,Substrate Specificities
D050803 Leucine Dehydrogenase An octameric enzyme belonging to the superfamily of amino acid dehydrogenases. Leucine dehydrogenase catalyzes the reversible oxidative deamination of L-LEUCINE, to 4-methyl-2-oxopentanoate (2-ketoisocaproate) and AMMONIA, with the corresponding reduction of the cofactor NAD+. L-Leucine Dehydrogenase,Leucine (Branched-Chain Amino Acid) Dehydrogenase,Dehydrogenase, L-Leucine,Dehydrogenase, Leucine,L Leucine Dehydrogenase

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