Отправить статью по E-mail Assessment of Formate Dehydrogenase Stress Stability in vivo using Inactivation by Hydrogen Peroxide
- Авторы: Savin SS1, Tishkov VI1
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Учреждения:
- Выпуск: Том 2, № 1 (2010)
- Страницы: 97-101
- Раздел: Статьи
- Дата подачи: 17.01.2020
- Дата публикации: 15.03.2010
- URL: https://actanaturae.ru/2075-8251/article/view/10775
- DOI: https://doi.org/10.32607/20758251-2010-2-1-97-101
- ID: 10775
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Аннотация
Kinetic studies on hydrogen peroxide-induced inactivation of mutant formate dehydrogenase from Pseudomonas sp. 101 (PseFDH Cys255Ala) suggest a simple bimolecular mechanism for enzyme reaction with the inactivation agent. In the excess of hydrogen peroxide, the decrease in enzyme activity follows first-order kinetics. Therefore, the first-order effective inactivation kinetic constants determined for various FDH forms at a constant H 2O 2 concentration can be used as a quantitative measure of the enzyme stability. It was shown that two cysteine residues located in the active site formate- and coenzyme-binding domains (Cysl45 and Cys255, respectively) make similar contributions to the enzyme stability, while the contribution of Cys354 is insignificant. The inactivation kinetics of wild-type PseFDH, mutant PseFDH Cysl45Ser/Cys255Ala, and FDH produced under stress conditions by bacterium Staphylococcus aureus, higher plants Arabidopsis thaliana, and soya Glycine max, was studied. It was found that the stress-induced FDHs are at least 20 times more stable than the nonstress-induced PseFDH from Pseudomonas sp. 101 grown on methanol.
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Assessment of Formate Dehydrogenase Stress Stability in vivo using Inactivation by Hydrogen Peroxide×
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