Sulphoxidation of ethyl methyl sulphide, 4-chlorophenyl methyl sulphide and diphenyl sulphide by purified pig liver flavin-containing monooxygenase
| Autor: | I. P. Nnane, L. A. Damani |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Chromatography
Gas Stereochemistry Swine Health Toxicology and Mutagenesis Flavin-containing monooxygenase In Vitro Techniques Sulfides Toxicology Chlorobenzenes Biochemistry Medicinal chemistry Xenobiotics chemistry.chemical_compound Biotransformation Animals Monoamine Oxidase Chromatography High Pressure Liquid Pharmacology chemistry.chemical_classification Unspecific monooxygenase biology Superoxide Dismutase Sulfoxide General Medicine Metabolism Monooxygenase Reference Standards Catalase Kinetics Enzyme chemistry Liver Sulfoxides Calibration biology.protein Oxidation-Reduction Algorithms |
| Zdroj: | Xenobiotica; the fate of foreign compounds in biological systems. 33(1) |
| ISSN: | 0049-8254 |
| Popis: | 1. The biotransformation of ethyl methyl sulphide (EMS), 4-chlorophenyl methyl sulphide (CPMS) and diphenyl sulphide (DPS) to their corresponding sulphoxides by purified flavin-containing monooxygenase (FMO) is described. 2. Purified pig liver flavin-containing monooxygenase catalysed the sulphoxidation of EMS, CPMS and DPS to their corresponding sulphoxides and the reactions followed single enzyme Michelis-Menten kinetics. 3. The apparent K(m) and V(max) for the sulphoxidation of EMS were 1.38+/-0.05 mM and 78.74+/-3.9 nmoles mg(-1) protein min(-1), respectively. The apparent K(m) and V(max) for the sulphoxidation of CPMS were 0.185+/-0.03 mM and 103+/-5.0 nmoles mg(-1) protein min(-1), respectively. The apparent K(m) and V(max) for the sulphoxidation of DPS were 0.068+/-0.002 mM and 49.26+/-2.05 nmoles mg(-1) protein min(-1), respectively. 4. A significant reduction of the sulphoxidation of these simple sulphides was observed with addition of 1-naphthylthiourea in the incubation medium. On the other hand, incorporation of catalase and superoxide dismutase into the incubation media produced no appreciable inhibition of the observed sulphoxidation of the sulphides. 5. These results suggest that FMO is responsible, at least in part, for the sulphoxidation of nucleophilic sulphides as well as for the oxidation of sulphur atoms that reside within or adjacent to aromatic systems. |
| Databáze: | OpenAIRE |
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