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首页> 外文期刊>Journal of bacteriology >Changes in Membrane Lipid Composition in Exponentially Growing Staphylococcus aureus During the Shift from 37 to 25 C
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Changes in Membrane Lipid Composition in Exponentially Growing Staphylococcus aureus During the Shift from 37 to 25 C

机译：从37℃到25℃转变过程中指数增长的金黄色葡萄球菌膜脂成分的变化

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摘要

Lowering the temperature of growth of Staphylococcus aureus from 37 to 25 C decreased the growth rate and induced changes in the composition of the membrane lipids. Changes in lipid composition also occur in the transition between exponential and stationary growth phases at one temperature. To isolate the effects of lowering the temperature, exponentially growing S. aureus was abruptly switched from 37 to 25 C by transfer to cooler medium. Exponential growth continued at 25 C without a lag period but with a threefold increase in doubling time. In the period of exponential growth at suboptimal temperature, there was essentially no change in the fatty acid composition of the lipids, little change in the vitamin K2 composition with perhaps a slight increase in the total level, and essentially no change in the phospholipid composition, but a marked stimulation of the synthesis of the rubixanthins. Growth of cells at 25 C was much more sensitive to the inhibition of rubixanthin formation by mixed-function oxidase inhibitors than cells growing at 37 C, suggesting some function for the rubixanthins at suboptimal temperatures. The striking increases in the proportions of monoenoic fatty acids observed at lowered growth temperatures in many biological systems are not detected in S. aureus.
机译：将金黄色葡萄球菌的生长温度从37℃降低到25℃会降低生长速率并引起膜脂质组成的变化。在一个温度下，脂质组成的变化也发生在指数生长期与静止生长期之间的过渡中。为了隔离降低温度的影响， S呈指数增长。通过转移到较冷的培养基中，金黄色素突然从37°C切换到25°C。指数增长在25°C继续进行，没有滞后时间，但倍增时间增加了三倍。在最适温度下的指数增长时期，脂质的脂肪酸组成基本没有变化，维生素K 2 组成几乎没有变化，总水平可能略有上升，并且磷脂组成基本上没有变化，但是显着刺激了红黄素的合成。与在37°C下生长的细胞相比，在25°C下细胞的生长对混合功能氧化酶抑制剂抑制红花黄素形成的敏感性要高得多，这表明在最佳温度下，对于红黄素具有某些功能。在 S中未检测到在许多生物系统中较低的生长温度下观察到的单烯脂肪酸的比例显着增加。金黄色。

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