Kinetics of hydrolysis of acetylthiocholine and acetylcholine by cholinesterases. 2005

A Komersová, and K Komers, and P Zdrazilová
Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Czech Republic.

Kinetics of hydrolysis of acetylthiocholine (ATCH) and acetylcholine (ACH) by butyrylcholinesterase (BCHE) and acetylcholinesterase (ACHE) are studied. ATCH is used for testing of enzymatic hydrolysis of ACH in vitro, because mechanism of ATCH hydrolysis is qualitatively similar to ACH and its reaction course can be quantitatively on-line measured by two independent methods: spectrophotometrical (determination of thiocholine - product of ATCH hydrolysis - using Ellman's method) and electrochemical (determination of acetic acid - product of ATCH hydrolysis - by pH-stat method). All tested hydrolyses correspond to the Michaelis-Menten's equation with the second irreversible step up to the total exhaustion of the substrate. The correlations were made by means of differential and integral kinetic equations describing Michaelis-Menten model. The optimal values of Michaelis constant (KM), maximum velocity (Vm), kinetic constants of single reaction steps and absolute concentration of the used enzyme were calculated for each experiment.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D002802 Cholinesterases Acylcholineacylhydrolase,Cholase,Cholinesterase
D006868 Hydrolysis The process of cleaving a chemical compound by the addition of a molecule of water.
D000109 Acetylcholine A neurotransmitter found at neuromuscular junctions, autonomic ganglia, parasympathetic effector junctions, a subset of sympathetic effector junctions, and at many sites in the central nervous system. 2-(Acetyloxy)-N,N,N-trimethylethanaminium,Acetilcolina Cusi,Acetylcholine Bromide,Acetylcholine Chloride,Acetylcholine Fluoride,Acetylcholine Hydroxide,Acetylcholine Iodide,Acetylcholine L-Tartrate,Acetylcholine Perchlorate,Acetylcholine Picrate,Acetylcholine Picrate (1:1),Acetylcholine Sulfate (1:1),Bromoacetylcholine,Chloroacetylcholine,Miochol,Acetylcholine L Tartrate,Bromide, Acetylcholine,Cusi, Acetilcolina,Fluoride, Acetylcholine,Hydroxide, Acetylcholine,Iodide, Acetylcholine,L-Tartrate, Acetylcholine,Perchlorate, Acetylcholine
D000122 Acetylthiocholine An agent used as a substrate in assays for cholinesterases, especially to discriminate among enzyme types. (2-Mercaptoethyl)trimethylammonium Acetate

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