title: RAF1-activated MEK1 is found on the Golgi apparatus in late prophase and is required for Golgi complex fragmentation in mitosis.
abstract: Amitotically activated mitogen-activated protein kinase 1 (MEK1) fragments the pericentriolar Golgi stacks in mammalian cells. We show that activated MEK1 is found on the Golgi apparatus in late prophase. The fragmented and dispersed Golgi membranes in prometaphase and later stages of mitosis do not contain activated MEK1. MEK1-dependent Golgi complex fragmentation is through activation by RAF1 and not MEK1 kinase 1. We propose that a RAF1-dependent activation of MEK1 and its presence on the Golgi apparatus in late prophase is required for Golgi complex fragmentation.
authors.affiliation: Cell and Developmental Biology Biology, University of California, San Diego, La Jolla, CA 92093-0347, USA.
authors.forename: Antonino
authors.initials: A
authors.lastname: Colanzi
authors.forename: Christine
authors.initials: C
authors.lastname: Sutterlin
authors.forename: Vivek
authors.initials: V
authors.lastname: Malhotra
mesh_terms: D016475:3T3 Cells; D021581:Active Transport, Cell Nucleus / Q000187:drug effects / Q000235:genetics; D000818:Animals; D016590:Aphidicolin / Q000494:pharmacology; D019556:COS Cells; D002451:Cell Compartmentation / Q000187:drug effects / Q000235:genetics; D005057:Eukaryotic Cells / Q000378:metabolism* / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000378:metabolism* / Q000648:ultrastructure; D006367:HeLa Cells; D006801:Humans; D007425:Intracellular Membranes / Q000187:drug effects / Q000378:metabolism; D048369:MAP Kinase Kinase 1; D051379:Mice; D020929:Mitogen-Activated Protein Kinase Kinases / Q000235:genetics / Q000378:metabolism*; D008938:Mitosis / Q000235:genetics*; D011418:Prophase / Q000235:genetics*; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D021381:Protein Transport / Q000187:drug effects / Q000235:genetics; D019908:Proto-Oncogene Proteins c-raf / Q000235:genetics / Q000378:metabolism*; D051381:Rats
chemical_list: D016590:Aphidicolin; D017346:Protein Serine-Threonine Kinases; D019908:Proto-Oncogene Proteins c-raf; D048369:MAP Kinase Kinase 1; C482125:MAP2K1 protein, human; C482127:Map2k1 protein, mouse; D020929:Mitogen-Activated Protein Kinase Kinases