Biomaterial Database

[Biotransformation of benzamidine and benzamidoxime by microsomal enzymes of the rabbit]. 1989

B Clement, and M Zimmermann, and S Schmitt

At pH 7.4 neither benzamidine (1) is ring-hydroxylated nor benzamidoxime (2) is N-hydroxylated, reduced or ring-hydroxylated by aerobic incubations with microsomal fractions (12000 g supernatant, microsomes) of rabbit liver homogenates and NADPH. Products of hydrolytic processes are also not detected. A very long incubation period and a pH 6.3 are necessary for the detection of a slight reduction of benzamidoxime (2) to benzamidine (1). Results are obtained by use of synthetic reference material and by newly developed HPLC methods. Thus, kinetic studies of the microsomal N-hydroxylation of benzamidine (1) to benzamidoxime (2) in the presence of N-methylbenzamidine (3) performed at pH 7.4 are not influenced by other transformations and provide evidence for the involvement of the same isoenzyme of cytochrome P-450 for both the N-hydroxylation of 1 and the N-dealkylation of 3.

UI	MeSH Term	Description	Entries
D008862	Microsomes, Liver	Closed vesicles of fragmented endoplasmic reticulum created when liver cells or tissue are disrupted by homogenization. They may be smooth or rough.	Liver Microsomes,Liver Microsome,Microsome, Liver
D011817	Rabbits	A burrowing plant-eating mammal with hind limbs that are longer than its fore limbs. It belongs to the family Leporidae of the order Lagomorpha, and in contrast to hares, possesses 22 instead of 24 pairs of chromosomes.	Belgian Hare,New Zealand Rabbit,New Zealand Rabbits,New Zealand White Rabbit,Rabbit,Rabbit, Domestic,Chinchilla Rabbits,NZW Rabbits,New Zealand White Rabbits,Oryctolagus cuniculus,Chinchilla Rabbit,Domestic Rabbit,Domestic Rabbits,Hare, Belgian,NZW Rabbit,Rabbit, Chinchilla,Rabbit, NZW,Rabbit, New Zealand,Rabbits, Chinchilla,Rabbits, Domestic,Rabbits, NZW,Rabbits, New Zealand,Zealand Rabbit, New,Zealand Rabbits, New,cuniculus, Oryctolagus
D000578	Amidines	Derivatives of oxoacids RnE(
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
D001550	Benzamidines	Amidines substituted with a benzene group. Benzamidine and its derivatives are known as peptidase inhibitors.
D001711	Biotransformation	The chemical alteration of an exogenous substance by or in a biological system. The alteration may inactivate the compound or it may result in the production of an active metabolite of an inactive parent compound. The alterations may be divided into METABOLIC DETOXICATION, PHASE I and METABOLIC DETOXICATION, PHASE II.
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