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- W2030015712 abstract "An enzyme responsible for the reversible oxidative deamination of the l(+)-alanine is present in Bacillus subtilis. This enzyme, called l(+)-alanine-dehydrogenase, functions specifically with DPN. The enzyme has been partially purified. It is relatively thermo- and alkali-stable, and is partially inhibited by sulfhydryl reagents. Its optimum pH is 10. Homologues of alanine are very slightly oxidized by it; in order of decreasing activity they are: α-aminobutyric acid, serine, vinylalanine, valine and norvaline. The energetics of the reaction and the Michaelis constants for the substrates have been determined. The specificity of the enzyme makes it suitable for use in the quantitative determination of l(+)-alanine in amounts of 0.1 to 0.3 μmoles. Il existe chez Bacillus subtilis un enzyme qui catalyse la désamination oxydative et réversible de la l(+)-alanine. Son action est couplée spécifiquement à la réduction du coferment I. L'enzyme a été appelé l(+)-alanine-déshydrogénase. L'enzyme se classe dans les protéines constituant la masse la plus importante des protéines cellulaires, mais il a pu être purifié en tirant parti de quelques propriétés qui lui sont propres, en particulier, sa résistance à la chaleur et aux alcalis. Son pH optimum est voisin de 10. Cet enzyme est partiellement sensible aux inhibiteurs des groupes sulfhydryles. La l(+)-alanine-déshydrogénase catalyse la déshydrogénation de la l-(+)-alanine à une vitesse beaucoup plus grande que pour tout autre acide aminé. Les quelques acides aminés homologues qui montrent une légère activité sont par ordre décroissant d'activité: l'acide α-aminobutyrique, la sérine, la vinylalanine, la valine et la norvaline. Une faible activité observée vis-à-vis de la d(—)-alanine est néanmoins douteuse. Les constantes de Michaelis de la l(+)-alanine, du pyruvate, du DPN, du DPNH et de l'AlDHase ont été déterminées. La spécificité de l'enzyme permet son utilisation pour le dosage de la l(+)-alanine en très faible quantité (0.1 à 0.3 μM). L'étude de l'équilibre de la réaction a permis de déterminer directement l'énergétique de celle-ci." @default.
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- W2030015712 date "1960-01-01" @default.
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- W2030015712 title "Propriétés de la l(+)-alanine-déshydrogénase" @default.
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- W2030015712 doi "https://doi.org/10.1016/0006-3002(60)90506-0" @default.
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