TY - JOUR
T1 - Active ADP-ribosylation factor-1 (ARF1) is required for mitotic Golgi fragmentation
AU - Xiang, Yi
AU - Seemann, Joachim
AU - Bisel, Blaine
AU - Punthambaker, Sukanya
AU - Wang, Yanzhuang
PY - 2007/7/27
Y1 - 2007/7/27
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=34547591790&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34547591790&partnerID=8YFLogxK
U2 - 10.1074/jbc.M611716200
DO - 10.1074/jbc.M611716200
M3 - Article
C2 - 17562717
AN - SCOPUS:34547591790
SN - 0021-9258
VL - 282
SP - 21829
EP - 21837
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 30
ER -