Abstract
Phosphorylation of CMP and formation of CDP-choline were tested with various haploid cells of yeasts. Most of them had more or less the ability, but a mutant (Lys–M7, alpha type) of Saccharomyces rouxii was found to lack the ability. Further study revealed the change of the temperature-sensitivity of the mutant, which could not produce CDP-choline when treated at 37°C, whereas it could at 16°C. The growth of the mutant was more sensitive to temperatures than that of the wild strain. The former did not grow at 36.3°C, while the latter grew.
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