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During zonal centrifugations of homogenates from glucose-repressed Saccharomyces cerevisiae, the buoyant densities of various plasma-membrane fragments greatly depend on their content of heavy glycoprotein particles (Nurminen, Taskinen & Suomalainen, I 976). Experiments with homogenates from aerobic S. cerevisiae are described here. A complicating factor in the isolation of the yeast plasma membrane is that the only marker enzyme known for it, Mg2+-dependent adenosine triphosphatase (Mg-ATPase), is also present in mitochondria. The mitochondrial Mg-ATPase, however, differs from the Mg-ATPase of the plasma membrane in being oligomycin-sensitive. In aerobic yeast, fully developed mitochondria are readily detectable in electron micrographs and the activity of the typical mitochondrial enzymes is high. Therefore the possible presence of mitochondrial membranes in the preparations of plasma membranes is easier to detect than in the glucose-repressed yeast.

Distribution of Plasma-membrane Fragments during Zonal Centrifugations of Homogenates from Aerobic Saccharomyces cerevisiae