Weislogel P O, Butow R A
Proc Natl Acad Sci U S A. 1970 Sep;67(1):52-8. doi: 10.1073/pnas.67.1.52.
A cold-sensitive mutant of a haploid strain of Saccharomyces cerevisiae has been isolated by selection for impaired growth at 18 degrees on nonfermentable carbon sources. Growth of the mutant on glucose or galactose at either 28 or 18 degrees is similar to that of the parental strain. The cold-sensitive strain is highly mutable to a cytoplasmic petite when grown at 18 degrees , or when grown at 28 degrees in the presence of 4 mg/ml of chloramphenicol. Cold sensitivity is not observed in the conversion of promitochondria to mitochondria. We conclude that mitochondrial protein synthesis is required for maintaining the stability of the mitochondrial genome.
通过在18摄氏度下于非发酵性碳源上筛选生长受损的菌株,分离出了酿酒酵母单倍体菌株的一个冷敏感突变体。该突变体在28摄氏度或18摄氏度下于葡萄糖或半乳糖上的生长情况与亲本菌株相似。当在18摄氏度下生长,或在28摄氏度下于4毫克/毫升氯霉素存在的情况下生长时,该冷敏感菌株极易突变为细胞质小菌落。在原线粒体向线粒体的转变过程中未观察到冷敏感性。我们得出结论,线粒体蛋白质合成对于维持线粒体基因组的稳定性是必需的。