title: Active ADP-ribosylation factor-1 (ARF1) is required for mitotic Golgi fragmentation.
abstract: In mammalian cells the Golgi apparatus undergoes an extensive disassembly process at the onset of mitosis that is believed to facilitate equal partitioning of this organelle into the two daughter cells. However, the underlying mechanisms for this fragmentation process are so far unclear. Here we have investigated the role of the ADP-ribosylation factor-1 (ARF1) in this process to determine whether Golgi fragmentation in mitosis is mediated by vesicle budding. ARF1 is a small GTPase that is required for COPI vesicle formation from the Golgi membranes. Treatment of Golgi membranes with mitotic cytosol or with purified coatomer together with wild type ARF1 or its constitutive active form, but not the inactive mutant, converted the Golgi membranes into COPI vesicles. ARF1-depleted mitotic cytosol failed to fragment Golgi membranes. ARF1 is associated with Golgi vesicles generated in vitro and with vesicles in mitotic cells. In addition, microinjection of constitutive active ARF1 did not affect mitotic Golgi fragmentation or cell progression through mitosis. Our results show that ARF1 is active during mitosis and that this activity is required for mitotic Golgi fragmentation.
authors.affiliation: Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-1048, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xiang
authors.forename: Joachim
authors.initials: J
authors.lastname: Seemann
authors.forename: Blaine
authors.initials: B
authors.lastname: Bisel
authors.forename: Sukanya
authors.initials: S
authors.lastname: Punthambaker
authors.forename: Yanzhuang
authors.initials: Y
authors.lastname: Wang
mesh_terms: D020823:ADP-Ribosylation Factor 1 / Q000172:deficiency / Q000235:genetics / Q000502:physiology*; D000818:Animals; D018076:DNA, Complementary; D006056:Golgi Apparatus / Q000502:physiology / Q000648:ultrastructure*; D006153:Guanosine Diphosphate / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D007425:Intracellular Membranes / Q000378:metabolism; D008099:Liver / Q000502:physiology; D008938:Mitosis / Q000502:physiology*; D010957:Plasmids; D051381:Rats; D011994:Recombinant Proteins / Q000378:metabolism; D014162:Transfection
chemical_list: D018076:DNA, Complementary; D011994:Recombinant Proteins; D006153:Guanosine Diphosphate; D020823:ADP-Ribosylation Factor 1