Abstract
Nine strains of methanol-utilizing yeasts belonging to the genera Candida, Hansenula, Kloeckera, Pichia, and Torulopsis were examined with respect to the interrelationship between their catalase content and ultrastructure. Methanol-grown cells of all the yeasts tested showed higher catalase activities than the respective ethanol- and glucose-grown cells. In connection with this, occurrence of a specific organelle surrounded by a single-unit membrane ("microbodies") was observed only in the methanol-grown cells. Several morphological differences were observed between the microbodies of methanol-utilizing yeasts and those of hydrocarbon-utilizing yeasts such as Candida tropicalis. That is, microbodies of methanol utilizers were large in size, existed in closely associated forms, and had crystalloid structures. Localization of catalase activity in these microbodies was demonstrated cytochemically by use of 3,3'-diaminobenzidene. Especially, 3,3'-diaminobenzidine reaction product accumulated heavily in crystalloids of yeast microbodies.
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