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[Substrate specificity, inhibitors and kinetics of deamidase AG (asparaginase-glutaminase) from Pseudomonas fluorescens AG]. 1977

N A Kovalenko, and T A Tsvetkova, and A Ia Nikolaev

Deamidase AG (asparaginase-glutaminase) from Pseudomonas fluorescens AG was shown to hydrolyze 1-glutamine and 1-asparagine highly effectively. Besides, the enzyme exhibited the rather high rate of deamidation of D-asparagine and D-glutamine (70% and 100%, respectively), Nalpha-butyl asparagine (63%) and among peptides -- of glycyl-L-asparagine (40%). L-glutamic acid gamma-methyl ester was hydrolyzed only slightly (5%). Effect of several substrate analogues on the deamidase AG activity was studied as well. Albiciine (alpha-amino-beta-ureide propionic acid) proved to be the strongest inhibitor (100%). Beta-Methyl aspartic acid, S-carbamoyl cysteine, alpha-ketoglutaric acid showed the slight inhibitory effect (20%). Amount of active centres per enzyme molecule was estimated by means of 14C-albiciine. Deamidase AG had apparently only one active centre. In estimation of relationship between the rate of reaction and substrate (L-asparagine) concentration, the reaction was found to follow Michaelis-Menten kinetics, K(m) = 4.5 with 10-4 M.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D011551 Pseudomonas fluorescens A species of nonpathogenic fluorescent bacteria found in feces, sewage, soil, and water, and which liquefy gelatin. Bacillus fluorescens,Bacillus fluorescens liquefaciens,Bacterium fluorescens,Liquidomonas fluorescens
D003641 Deamination The removal of an amino group (NH2) from a chemical compound. Deaminations
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D004789 Enzyme Activation Conversion of an inactive form of an enzyme to one possessing metabolic activity. It includes 1, activation by ions (activators); 2, activation by cofactors (coenzymes); and 3, conversion of an enzyme precursor (proenzyme or zymogen) to an active enzyme. Activation, Enzyme,Activations, Enzyme,Enzyme Activations
D005972 Glutaminase Phosphate-Activated Glutaminase,Glutaminase, Phosphate-Activated,Phosphate Activated Glutaminase
D006868 Hydrolysis The process of cleaving a chemical compound by the addition of a molecule of water.
D001215 Asparaginase A hydrolase enzyme that converts L-asparagine and water to L-aspartate and NH3. EC 3.5.1.1. Asparaginase II,Asparaginase medac,Asparagine Deaminase,Colaspase,Crasnitin,Elspar,Erwinase,Kidrolase,Leunase,Paronal,Deaminase, Asparagine,medac, Asparaginase
D001665 Binding Sites The parts of a macromolecule that directly participate in its specific combination with another molecule. Combining Site,Binding Site,Combining Sites,Site, Binding,Site, Combining,Sites, Binding,Sites, Combining
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

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