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. 1994 Oct 17;13(20):4908–4918. doi: 10.1002/j.1460-2075.1994.tb06818.x

PAS7 encodes a novel yeast member of the WD-40 protein family essential for import of 3-oxoacyl-CoA thiolase, a PTS2-containing protein, into peroxisomes.

M Marzioch 1, R Erdmann 1, M Veenhuis 1, W H Kunau 1
PMCID: PMC395431  PMID: 7957058

Abstract

To identify components of the peroxisomal import pathway in yeast, we have isolated pas mutants affected in peroxisome biogenesis. Two mutants assigned to complementation group 7 define a new gene, PAS7, whose product is necessary for import of thiolase, a PTS2-containing protein, but not for that of SKL (PTS1)-containing proteins, into peroxisomes. We have cloned PAS7 by complementation of the oleic acid non-utilizing phenotype of the pas7-1 strain. The DNA sequence predicts a 42.3 kDa polypeptide of 375 amino acids encoding a novel member of the beta-transducin related (WD-40) protein family. A Myc epitope-tagged Pas7p, expressed under the control of the CUP1 promotor, was functionally active. Subcellular localization studies revealed that in the presence of thiolase this epitope-tagged Pas7p in part associates with peroxisomes. However, in a thiolase-deficient mutant, Pas7p was entirely found in the cytoplasm. We suggest that Pas7p mediates the binding of thiolase to these organelles.

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