Genetics, Vol 135, 731-740, Copyright © 1993

INVESTIGATIONS

An Efficient Positive Selection Procedure for the Isolation of Peroxisomal Import and Peroxisome Assembly Mutants of Saccharomyces cerevisiae

Y. Elgersma, M. van-den-Berg, H. F. Tabak and B. Distel
E. C. Slater Institute, Biocentre, Academical Medical Centre, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands

To study peroxisome biogenesis, we developed a procedure to select for Saccharomyces cerevisiae mutants defective in peroxisomal protein import or peroxisome assembly. For this purpose, a chimeric gene was constructed encoding the bleomycin resistance protein linked to the peroxisomal protein luciferase. In wild-type cells this chimeric protein is imported into the peroxisome, which prevents the neutralizing interaction of the chimeric protein with its toxic phleomycin ligand. Peroxisomal import and peroxisome assembly mutants are unable to import this chimeric protein into their peroxisomes. This enables the bleomycin moiety of the chimeric protein to bind phleomycin, thereby preventing its toxicity. The selection is very efficient: upon mutagenesis, 84 (10%) of 800 phleomycin resistant colonies tested were unable to grow on oleic acid. This rate could be increased to 25% using more stringent selection conditions. The selection procedure is very specific; all oleic acid non utilizing (onu) mutants tested were disturbed in peroxisomal import and/or peroxisome assembly. The pas (peroxisome assembly) mutants that have been used for complementation analysis represent 12 complementation groups including three novel ones, designated pas20, pas21 and pas22.

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