title: A dual function for Pex3p in peroxisome formation and inheritance.
abstract: Saccharomyces cerevisiae Pex3p has been shown to act at the ER during de novo peroxisome formation. However, its steady state is at the peroxisomal membrane, where its role is debated. Here we show that Pex3p has a dual function: one in peroxisome formation and one in peroxisome segregation. We show that the peroxisome retention factor Inp1p interacts physically with Pex3p in vitro and in vivo, and split-GFP analysis shows that the site of interaction is the peroxisomal membrane. Furthermore, we have generated PEX3 alleles that support peroxisome formation but fail to support recruitment of Inp1p to peroxisomes, and as a consequence are affected in peroxisome segregation. We conclude that Pex3p functions as an anchor for Inp1p at the peroxisomal membrane, and that this function is independent of its role at the ER in peroxisome biogenesis.
authors: Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, England, UK.
authors: Joanne M
authors: JM
authors: Munck
authors: Alison M
authors: AM
authors: Motley
authors: James M
authors: JM
authors: Nuttall
authors: Ewald H
authors: EH
authors: Hettema
mesh_terms: D007425:Intracellular Membranes / Q000378:metabolism / Q000502:physiology; D008565:Membrane Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D050506:Mutant Chimeric Proteins / Q000235:genetics / Q000502:physiology; D000074401:Peroxins; D020675:Peroxisomes / Q000235:genetics* / Q000378:metabolism* / Q000502:physiology; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*
chemical_list: C502615:INP1 protein, S cerevisiae; D008565:Membrane Proteins; D050506:Mutant Chimeric Proteins; C070895:PEX3 protein, S cerevisiae; D000074401:Peroxins; D029701:Saccharomyces cerevisiae Proteins