Abstract
We have studied the synthesis and subcellular location of peroxisomal membrane proteins (PMPs) in cells of a peroxisome-deficient (per) mutant of the methylotrophic yeast Hansenula polymorpha. Western blot analysis of methanol-induced cells of the per mutant, which had been growing in a continuous culture on a glucose/methanol mixture, indicated that various PMPs were normally synthesized. As in wild type (WT) cells, the levels of PMP synthesis appeared to be dependent on specific cultivation conditions, e.g. the carbon source used for growth. In contrast to WT controls, PMPs in methanol-induced per mutants were not subject to proteolytic degradation. Biochemical and immuno(cyto)chemical studies suggested that the PMPs in methanol-induced per cells were located in small proteinaceous aggregates, separated from peroxisomal matrix proteins that were also present in the cytosol. Vesicular membranous structures, resembling the morphology of intact peroxisomes, were never detected irrespective of the growth conditions employed.
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