Abstract
An adaptive formation of ubiquinone occurs when yeast cells taken from a commercial compressed block are aerated in a medium containing glucose. Radioactivity from shikimic-1,2- 14C acid, although only poorly incorporated into the lipid fraction of yeast, is entirely associated with ubiquinone. Radioactivity from malonic-2- 14C acid is incorporated only into the hexaprenyl side chain of ubiquinone in yeast. p-Hydroxy-U- 14C benzoic acid is effectively incorporated into the ubiquinone nucleus in aerobic yeast cells and Phycomyces blakesleeanus. In the former organism anaerobiosis inhibits the incorporation of this substrate into ubiquinone. In Agaricus campestris, extensive degradation of the substrate occurred. No conclusive evidence could be found for the presence of 2-multiprenylphenols or 2-multiprenyl-6-methoxyphenols in these organisms. Radioactivity from l-[ methyl- 14C]methionine is incorporated into the ring C- and O-methyl groups of ubiquinone in yeast.
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