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Import of alcohol oxidase into peroxisomes of Saccharomyces cerevisiae.

Saccharomyces cerevisiae is unable to grow on methanol because it lacks the enzymes required for its metabolism. To study the possibility of whether or not the methanol oxidation pathway of Hansenula polymorpha can be transferred to S. cerevisiae, the gene coding for alcohol oxidase, a peroxisomal homo‐octameric flavoprotein, was introduced into S. cerevisiae. Transformed cells contain varying amounts of alcohol oxidase depending on the plasmid used. Immunocytochemical experiments indicate that the protein is imported into peroxisomes, whether organelle proliferation is induced or not. Cells lack alcohol oxidase activity however, and only the monomeric, non‐functional, form of the protein is found. These findings indicate that the H. polymorpha peroxisomal targeting signal of alcohol oxidase is recognized in S. cerevisiae and protein monomers are imported.