Piezotolerance of the Respiratory Terminal Oxidase Activity of the Piezophilic Shewanella violacea DSS12 as Compared with Non-Piezophilic Shewanella Species
スポンサーリンク
概要
- 論文の詳細を見る
The facultative piezophile Shewanella violacea DSS12 is known to alter its respiratory components under the influence of hydrostatic pressure during growth, suggesting that it has a respiratory system that functions in adaptation to high pressure. We investigated the pressure- and temperature-dependencies of the respiratory terminal oxidase activity of the membrane of S. violacea relative to non-piezophilic Shewanella species. We observed that the activity in the membrane of S. violacea was more resistant to high pressure than those of non-piezophilic Shewanella even though DSS12 was cultured under atmospheric pressure. On the other hand, the temperature dependency of this activity was almost the same for all of the tested strain regardless of optimal growth temperature. Both high pressure and low temperature are expected to lower protein flexibility, causing a decrease in enzyme activity, but the results of this study suggest that the mechanism maintaining enzyme activity under high hydrostatic pressure is different from that at low temperature. Additionally, the responses of the activity to the pressure- and temperature-changes were independent of membrane lipid composition. Therefore, the piezotolerance of the respiratory terminal oxidases of S. violacea is perhaps dependent on the properties of the protein itself and not on the lipid composition of the membrane. Our observations suggest that S. violacea constitutively express piezotolerant respiratory terminal oxidases that serve adaptation to the deep-sea environment.
論文 | ランダム
- Inhibition of hepatitis C virus replication by chloroquine targeting virus-associated autophagy
- Slit diaphragm dysfunction in proteinuric states : identification of novel therapeutic targets for nephrotic syndrome
- 肝内胆管癌切除例の画像診断学的特徴についての検討
- 6 数学的な考え方
- 6. 数学的な考え方 (中学校部会)