PMID: 6988386Feb 1, 1980Paper

Yeast mutants auxotrophic for choline or ethanolamine

Journal of Bacteriology
K D AtkinsonS Fogel

Abstract

Three mutants of the yeast Saccharomyces cerevisiae which require exogenous ethanolamine or choline were isolated. The mutants map to a single locus (cho1) on chromosome V. The lipid composition suggests that cho1 mutants do not synthesize phosphatidylserine under any growth conditions. If phosphatidylethanolamine or phosphatidylcholine, which are usually derived from phosphatidylserine, were synthesized from exogenous ethanolamine or choline, the mutants grew and divided relatively normally. However, mitochondrial abnormalities were evident even when ethanolamine and choline were supplied. Diploids homozygous for the cho1 mutation were defective in sporulation. Growth on nonfermentable carbon sources was slow, and a high proportion of respiratory-deficient (petite) cells were generated in cho1 cultures.

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Related Concepts

Choline Hydroxide
Ethanolamines
Inositol
Phosphatidylserines
Phospholipids
Saccharomyces cerevisiae

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