منابع مشابه
Nature of Butyrate Oxidation by Mycoplasma Hominis.
VanDemark, P. J. (Cornell University, Ithaca, N.Y.), and P. F. Smith. Nature of butyrate oxidation by Mycoplasma hominis. J. Bacteriol. 89:373-377. 1965.-Cell-free extracts of butyrate - grown Mycoplasma hominis strain O7, though lacking thiokinase activity on butyric acid, were found to activate butyrate via an acetyl-butyric thiophorase. These extracts also contained an aceto-coenzyme A (CoA)...
متن کاملNicotine 5'-oxidation and methyl oxidation by P450 2A enzymes.
In smokers, the primary pathway of nicotine metabolism is P450 2A6-catalyzed 5'-oxidation. The nicotine Delta(5'(1'))-iminium ion product of this reaction is further metabolized to cotinine by aldehyde oxidase. Previous investigators have reported kinetic parameters for cotinine formation using human liver cytosol as a source of aldehyde oxidase. Using [5-(3)H]nicotine and radioflow high-perfor...
متن کاملOxidation Catalysis by Enzymes in Microemulsions
Microemulsions are regarded as “the ultimate enzyme microreactors” for liquid oxidations. Their structure, composed of water nanodroplets dispersed in a non-polar medium, provides several benefits for their use as media for enzymatic transformations. They have the ability to overcome the solubility limitations of hydrophobic substrates, enhance the enzymatic activity (superactivity phenomenon) ...
متن کاملMetabolism of acetate, propionate and butyrate by sheep-liver slices.
Short-chain fatty acids constitute a major energy source in ruminants (Annison & Lewis, 1959). These products of ruminal fermentation are absorbed directly into portal blood and pass to the liver before reaching the general circulation. Examination of arterial and portal blood in sheep has indicated that propionate and butyrate are almost completely removed by the liver under normal feeding con...
متن کاملSynthesis of acetoacetate by liver enzymes.
Two mechanisms have been proposed for the formation of acetoacetate from acetyl-CoA by liver preparations. With the use of a partially purified system prepared from acetone powders of beef liver, Lynen et al. (1) obtained evidence that acetoacetate formation proceeded via P-hydroxy-fi-methylglutaryl coensyme A as intermediate and involved the HlMG-COAT condensing and HMG-Coh cleavage enzymes as...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1944
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)51212-6