嗜热脂肪芽孢杆菌热致死与膜流动性之间的相关性
Correlation between thermal death and membrane fluidity in Bacillus stearothermophilus.
作者信息
Esser A F, Souza K A
出版信息
Proc Natl Acad Sci U S A. 1974 Oct;71(10):4111-5. doi: 10.1073/pnas.71.10.4111.
Abstract
Paramagnetic resonance spectra of spin labels partitioned into spheroplast membranes of Bacillus stearothermophilus indicate lateral lipid phase separations. Cells adjust their lipid composition in response to temperature changes so that the same change of state in membrane phospholipids is achieved at the respective growth temperature. A temperature-sensitive mutant that fails to change its lipid composition above a certain temperature can survive only up to the higher temperature boundary for lateral phase separation. These data are interpreted to indicate that the maximal and minimal growth temperatures of thermophiles are regulated by the onset and conclusion of phase separations of the particular lipid composition they synthesize. It is suggested that isolated lipid domains are required for functional membrane assembly.
摘要
自旋标记物分配到嗜热脂肪芽孢杆菌原生质球膜中的顺磁共振光谱表明存在横向脂质相分离。细胞会根据温度变化调整其脂质组成，以便在各自的生长温度下实现膜磷脂相同的状态变化。一个在特定温度以上无法改变其脂质组成的温度敏感突变体，只能在横向相分离的较高温度边界以下存活。这些数据被解释为表明嗜热菌的最高和最低生长温度是由它们合成的特定脂质组成的相分离的开始和结束所调节的。有人提出，功能性膜组装需要分离的脂质结构域。
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