Publication

Mechanistic Studies of the Oxidation of Isoniazid by the Catalase Peroxidase from Mycobacterium tuberculosis

Kai Johnsson
1994
Journal Articles

Abstract

The enzymic oxidn. of isoniazid by the catalase-peroxidase of Mycobacterium tuberculosi was studied. The reaction products suggest two reaction pathways involving both electrophilic and radical species. Labeling expts. are consistent with a reaction mechanism involving the formation of an acyldiimide intermediate followed by decompn. to the corresponding aldehyde and peracid. The results suggest that isoniazid is oxidized by the catalase-peroxidase to a reactive species that may act by inactivating an essential enzyme of M. tuberculosis. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/13d87006-4370-4f7e-a34b-01dbdbaef73f

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Kai Johnsson
1994
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/13d87006-4370-4f7e-a34b-01dbdbaef73f

About this result

Related concepts (32)

Elimination reaction

An elimination reaction is a type of organic reaction in which two substituents are removed from a molecule in either a one- or two-step mechanism. The one-step mechanism is known as the E2 reaction, and the two-step mechanism is known as the E1 reaction. The numbers refer not to the number of steps in the mechanism, but rather to the kinetics of the reaction: E2 is bimolecular (second-order) while E1 is unimolecular (first-order). In cases where the molecule is able to stabilize an anion but possesses a poor leaving group, a third type of reaction, E1CB, exists.

Reaction mechanism

In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical reaction occurs. A chemical mechanism is a theoretical conjecture that tries to describe in detail what takes place at each stage of an overall chemical reaction. The detailed steps of a reaction are not observable in most cases. The conjectured mechanism is chosen because it is thermodynamically feasible and has experimental support in isolated intermediates (see next section) or other quantitative and qualitative characteristics of the reaction.

Mycobacterium tuberculosis

Mycobacterium tuberculosis (M. tb), also known as Koch's bacillus, is a species of pathogenic bacteria in the family Mycobacteriaceae and the causative agent of tuberculosis. First discovered in 1882 by Robert Koch, M. tuberculosis has an unusual, waxy coating on its cell surface primarily due to the presence of mycolic acid. This coating makes the cells impervious to Gram staining, and as a result, M. tuberculosis can appear weakly Gram-positive. Acid-fast stains such as Ziehl–Neelsen, or fluorescent stains such as auramine are used instead to identify M.

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Mechanistic Studies of the Oxidation of Isoniazid by the Catalase Peroxidase from Mycobacterium tuberculosis

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