title: A role for Fis1 in both mitochondrial and peroxisomal fission in mammalian cells.
abstract: The mammalian dynamin-like protein DLP1/Drp1 has been shown to mediate both mitochondrial and peroxisomal fission. In this study, we have examined whether hFis1, a mammalian homologue of yeast Fis1, which has been shown to participate in mitochondrial fission by an interaction with DLP1/Drp1, is also involved in peroxisomal growth and division. We show that hFis1 localizes to peroxisomes in addition to mitochondria. Through differential tagging and deletion experiments, we demonstrate that the transmembrane domain and the short C-terminal tail of hFis1 is both necessary and sufficient for its targeting to peroxisomes and mitochondria, whereas the N-terminal region is required for organelle fission. hFis1 promotes peroxisome division upon ectopic expression, whereas silencing of Fis1 by small interfering RNA inhibited fission and caused tubulation of peroxisomes. These findings provide the first evidence for a role of Fis1 in peroxisomal fission and suggest that the fission machinery of mitochondria and peroxisomes shares common components.
authors.affiliation: Department of Cell Biology and Cell Pathology, University of Marburg, 35037 Marburg, Germany.
authors.forename: Annett
authors.initials: A
authors.lastname: Koch
authors.forename: Yisang
authors.initials: Y
authors.lastname: Yoon
authors.forename: Nina A
authors.initials: NA
authors.lastname: Bonekamp
authors.forename: Mark A
authors.initials: MA
authors.lastname: McNiven
authors.forename: Michael
authors.initials: M
authors.lastname: Schrader
mesh_terms: D000818:Animals; D019556:COS Cells; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D034281:Dynamins; D020558:GTP Phosphohydrolases / Q000378:metabolism; D006801:Humans; D008565:Membrane Proteins / Q000737:chemistry* / Q000378:metabolism* / Q000502:physiology*; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism*; D024101:Mitochondrial Proteins / Q000378:metabolism / Q000502:physiology*; D020675:Peroxisomes / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000494:pharmacology; D051381:Rats; D014162:Transfection
chemical_list: C476525:FIS1 protein, human; D008565:Membrane Proteins; D008869:Microtubule-Associated Proteins; D024101:Mitochondrial Proteins; D034741:RNA, Small Interfering; D020558:GTP Phosphohydrolases; C110768:DNM1L protein, human; D034281:Dynamins