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J. Cell Biol., Volume 146, Number 1, July 12, 1999 71-84
Copyright © 1999 by The Rockefeller University Press.

GBF1: A Novel Golgi-associated BFA-resistant Guanine Nucleotide Exchange Factor That Displays Specificity for ADP-ribosylation Factor 5

Alejandro Claudea, Bao-Ping Zhaoa, Craig E. Kuziemskya, Sophie Dahanb, Scott J. Bergerc, Jian-Ping Yanc, Adrian D. Armoldc, Eric M. Sullivanc, and Paul Melançona
a Department of Cell Biology, University of Alberta, Edmonton, Alberta, Canada, T6G 2H7
b Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada, H3A 2B2
c Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309

Expression cloning from a cDNA library prepared from a mutant CHO cell line with Golgi-specific resistance to Brefeldin A (BFA) identified a novel 206-kD protein with a Sec7 domain termed GBF1 for Golgi BFA resistance factor 1. Overexpression of GBF1 allowed transfected cells to maintain normal Golgi morphology and grow in the presence of BFA. Golgi- enriched membrane fractions from such transfected cells displayed normal levels of ADP ribosylation factors (ARFs) activation and coat protein recruitment that were, however, BFA resistant. Hexahistidine-tagged–GBF1 exhibited BFA-resistant guanine nucleotide exchange activity that appears specific towards ARF5 at physiological Mg2+concentration. Characterization of cDNAs recovered from the mutant and wild-type parental lines established that transcripts in these cells had identical sequence and, therefore, that GBF1 was naturally BFA resistant. GBF1 was primarily cytosolic but a significant pool colocalized to a perinuclear structure with the ß-subunit of COPI. Immunogold labeling showed highest density of GBF1 over Golgi cisternae and significant labeling over pleiomorphic smooth vesiculotubular structures. The BFA-resistant nature of GBF1 suggests involvement in retrograde traffic.

Key Words: Golgi complex, Brefeldin A, Sec7, ADP-ribosylation factor, protein traffic


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