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3-Substituted pyrazole derivatives as inhibitors and inactivators of liver alcohol dehydrogenase. 1979

R W Fries, and D P Bohlken, and B V Plapp

3-Substituted pyrazoles, HOCH2 (1), HOCH2CH2 (2), HOCH2CH2CH2 (3), ClCH2 (4), ClCH2CH2 (5), ClCH2CH2CH2 (6), and CH3CO (7), were synthesized and evaluated in vitro on horse liver alcohol dehydrogenase for their potential as inhibitors of ethanol metabolism. 1 to 6 bound to the enzyme-NAD+ complex with dissociation constants of 40 to 200 microM, much higher than the constants for the corresponding 4-substituted pyrazoles, but with the same absorption maximum at 295 nm. 4 inactivated the enzyme within a few minutes, but NAD+ protected against reaction, and 4 nonspecifically alkylated many sulfur atoms in the protein. The isomer, 4-(chloromethyl)pyrazole, behaved similarly, 5 and 6 strongly inhibited the enzyme in the presence of NAD+, due to formation of the slowly dissociable (10(-3)s-1) enzyme-NAD+-pyrazole complex, but did not irreversibly inactivate the enzyme. 7 inhibits the enzyme weakly (Kp = 5 mM). It appears that the 3-substituted pyrazoles bind to the enzyme-NAD+ complex with the reactive functional group improperly positioned for specific irreversible reaction.

UI MeSH Term Description Entries
D008099 Liver A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances. Livers
D009243 NAD A coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH). (Dorland, 27th ed) Coenzyme I,DPN,Diphosphopyridine Nucleotide,Nadide,Nicotinamide-Adenine Dinucleotide,Dihydronicotinamide Adenine Dinucleotide,NADH,Adenine Dinucleotide, Dihydronicotinamide,Dinucleotide, Dihydronicotinamide Adenine,Dinucleotide, Nicotinamide-Adenine,Nicotinamide Adenine Dinucleotide,Nucleotide, Diphosphopyridine
D011720 Pyrazoles Azoles of two nitrogens at the 1,2 positions, next to each other, in contrast with IMIDAZOLES in which they are at the 1,3 positions.
D006736 Horses Large, hoofed mammals of the family EQUIDAE. Horses are active day and night with most of the day spent seeking and consuming food. Feeding peaks occur in the early morning and late afternoon, and there are several daily periods of rest. Equus caballus,Equus przewalskii,Horse, Domestic,Domestic Horse,Domestic Horses,Horse,Horses, Domestic
D000429 Alcohol Oxidoreductases A subclass of enzymes which includes all dehydrogenases acting on primary and secondary alcohols as well as hemiacetals. They are further classified according to the acceptor which can be NAD+ or NADP+ (subclass 1.1.1), cytochrome (1.1.2), oxygen (1.1.3), quinone (1.1.5), or another acceptor (1.1.99). Carbonyl Reductase,Ketone Reductase,Carbonyl Reductases,Ketone Reductases,Oxidoreductases, Alcohol,Reductase, Carbonyl,Reductase, Ketone,Reductases, Carbonyl,Reductases, Ketone
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
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
D066298 In Vitro Techniques Methods to study reactions or processes taking place in an artificial environment outside the living organism. In Vitro Test,In Vitro Testing,In Vitro Tests,In Vitro as Topic,In Vitro,In Vitro Technique,In Vitro Testings,Technique, In Vitro,Techniques, In Vitro,Test, In Vitro,Testing, In Vitro,Testings, In Vitro,Tests, In Vitro,Vitro Testing, In

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