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Vol. 11, Issue 4, 1241-1255, April 2000

A Family of ADP-Ribosylation Factor Effectors That Can Alter Membrane Transport through the trans-Golgi

Annette L. Boman,* Chun-jiang Zhang, Xinjun Zhu, and Richard A. Kahndagger

Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322-3050

A family of three structurally related proteins were cloned from human cDNA libraries by their ability to interact preferentially with the activated form of human ADP-ribosylation factor 3 (ARF3) in two-hybrid assays. The specific and GTP-dependent binding was later confirmed through direct protein binding of recombinant proteins. The three proteins share large (approx 300 residues) domains at their N termini that are 60-70% identical to each other and a shorter (73 residues) domain at their C termini with 70% homology to the C-terminal "ear" domain of gamma -adaptin. Although GGA1 is found predominantly as a soluble protein by cell fractionation, all three proteins were found to localize to the trans-Golgi network (TGN) by indirect immunofluorescence. The binding of GGAs to TGN was sensitive to brefeldin A, consistent with this being an ARF-dependent event. Thus, these proteins have been named Golgi-localizing, gamma -adaptin ear homology domain, ARF-binding proteins, or GGAs. The finding that overexpression of GGAs was sufficient to alter the distribution of markers of the TGN (TGN38 and mannose 6-phosphate receptors) led us to propose that GGAs are effectors for ARFs that function in the regulation of membrane traffic through the TGN.


* Present address: Department of Biochemistry and Molecular Biology, University of Minnesota, Duluth, MN 55812.

dagger Corresponding author. E-mail address: rkahn{at}bimcore.emory.edu.


Molecular Biology of the Cell
Vol. 11, 1241-1255, April 2000
Copyright © 2000 by The American Society for Cell Biology



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