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The peroxisomal membrane protein Inp2p is the peroxisome-specific receptor for the myosin V motor Myo2p of Saccharomyces cerevisiae.

Authors:
Fagarasanu A, Fagarasanu M, Eitzen GA, Aitchison JD, Rachubinski RA
Affiliation:
Journal:
Developmental cell

Abstract

The faithful inheritance of organelles by daughter cells is essential to maintain the benefits afforded to eukaryotic cells by compartmentalization of biochemical functions. In Saccharomyces cerevisiae, the class V myosin, Myo2p, is involved in transporting different organelles, including the peroxisome, along actin cables to the bud. We identified Inp2p as the peroxisome-specific receptor for Myo2p. Cells lacking Inp2p fail to partition peroxisomes to the bud but are unaffected in the inheritance of other organelles. Inp2p is a peroxisomal membrane protein, preferentially enriched in peroxisomes delivered to the bud. Inp2p interacts directly with the globular tail of Myo2p. Cells overproducing Inp2p often transfer their entire populations of peroxisomes to buds. The levels of Inp2p oscillate with the cell cycle. Organelle-specific receptors like Inp2p explain how a single motor can move different organelles in distinct and specific patterns. To our knowledge, Inp2p is the first peroxisomal protein implicated in the vectorial movement of peroxisomes.

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