环境诱导的嘉士伯酵母线粒体和内质网的变化。
Environmentally induced changes in mitochondria and endoplasmic reticulum of Saccharomyces carlsbergensis yeast.
作者信息
Damsky C H
出版信息
J Cell Biol. 1976 Oct;71(1):123-35. doi: 10.1083/jcb.71.1.123.
Abstract
The effects of culture environment on the volume density and surface density of mitochondria and endoplasmic reticulum in a facultative yeast were studied. When compared with cells grown aerobically on a nonrepressive substrate, cells grown in the absence of oxygen showed a sharp reduction in both volume density of mitochondria and surface density of the inner mitochondrial membrane (imm) in the remaining mitochondrial profiles. Use of fermentable (repressive) substrates under aerobic conditions restricted the volume density of mitochondria to a much greater extent than the surface density of imm. The range of mitochondrial volume densities in these experiments was 4-11%. Surface density of endoplasmic reticulum (ER) was sensitive to growth rate and in particular to changes in oxygen tension, showing large fluctuations during both anaerobic and aerobic adaptation. These fluctuations in ER are discussed in relation to the known role of this organelle in lipid metabolism.
摘要
研究了培养环境对兼性酵母中线粒体和内质网的体积密度及表面密度的影响。与在非抑制性底物上有氧生长的细胞相比，无氧条件下生长的细胞，其线粒体的体积密度以及剩余线粒体轮廓中线粒体内膜（imm）的表面密度均急剧降低。在有氧条件下使用可发酵（抑制性）底物时，线粒体的体积密度比imm的表面密度受到更大程度的限制。这些实验中线粒体体积密度的范围为4%-11%。内质网（ER）的表面密度对生长速率敏感，尤其对氧张力的变化敏感，在厌氧和好氧适应过程中均表现出较大波动。结合该细胞器在脂质代谢中的已知作用，对ER的这些波动进行了讨论。
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