COPI vesicles accumulating in the presence of a GTP restricted arf1 mutant are depleted of anterograde and retrograde cargo.
Microinjection of the slowly hydrolyzable GTP analogue GTP(gamma)S or the ectopic expression of a GTP restricted mutant of the small GTPase arf1 (arf1[Q71L]) leads to the rapid accumulation of COPI coated vesicles and buds in living cells. This effect is blocked at 15 degrees C and by microinjection of antibodies against (beta)-COP. Anterograde and retrograde membrane protein transport markers, which have been previously shown to be incorporated into COPI vesicles between the endoplasmic reticulum and Golgi complex, are depleted from the GTP(gamma)S or arf1[Q71L] induced COPI coated vesicles and buds. In contrast, in control cells 30 to 60% of the COPI carriers co-localize with these markers. These in vivo data corroborate recent in vitro work, suggesting that GTP(gamma)S and arf1[Q71L] interfere with the sorting of membrane proteins into Golgi derived COPI vesicles, and provide the first in vivo evidence for a role of GTP hydrolysis by arf1 in the sorting of cargo into COPI coated vesicles and buds.
Pepperkok
R
R
Cell Biophysics and Cell Biology Program, EMBL Heidelberg, Meyerhofstr.1, Germany. pepperko@embl-heidelberg.de.
Whitney
J A
JA
Gomez
M
M
Kreis
T E
TE
D020823:ADP-Ribosylation Factor 1 / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001692:Biological Transport / Q000187:drug effects; D015415:Biomarkers / Q000032:analysis; D020126:Brefeldin A / Q000494:pharmacology; D002522:Chlorocebus aethiops; D020755:Coat Protein Complex I / Q000378:metabolism*; D018699:Coated Vesicles / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D020756:Coatomer Protein / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000008:administration & dosage / Q000378:metabolism; D006160:Guanosine Triphosphate / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000378:metabolism*; D006165:Guanylyl Imidodiphosphate / Q000008:administration & dosage / Q000378:metabolism; D006868:Hydrolysis; D008565:Membrane Proteins / Q000378:metabolism*; D008845:Microinjections; D009154:Mutation / Q000235:genetics*; D013696:Temperature; D014709:Vero Cells
D015415:Biomarkers; D020755:Coat Protein Complex I; D020756:Coatomer Protein; D008565:Membrane Proteins; D020126:Brefeldin A; D006165:Guanylyl Imidodiphosphate; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate; D020823:ADP-Ribosylation Factor 1