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Previous reports on lipid synthesis in yea st homogenates have emphasized that the removal of the mitochondrial fraction does not diminislh the activity of these extracts (Klein and Booher, 1955; Klein, 1957). A fraction sedimenting in 30 min between 25,000 X G and 60,000 X G, wheni added to the supernatant obtained by centrifugation at 100,000 X G for 30 min, was found to be highly active in lipogenesis. On the other hand, Corwin et al. (1956), and Schuytema and Lata (1958) presented evidence f or the apparenit involvement of mitochondria. in fat formation in yeast extracts. These conflicting views may now be reconciled by findings to be detailed below. When yeast cells are subjected to mild conditions of rupture, the resulting (low protein) extracts are indeed inactive in the absence of the mitochondrial fraction. However, even in these preparations it can be shown that the enzymatic equipment involved in lipid synthesis is extramitochondrial, since low concentrations of ethylenediaminetetraacetate (EDTA) can substitute for the mitochondrial fraction.

LIPID SYNTHESIS IN LOW PROTEIN HOMOGENATES OF YEAST