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Journal of Cell Science, Vol 112, Issue 11 1645-1654, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
L Kjer-Nielsen, C van Vliet, R Erlich, BH Toh and PA Gleeson
Department of Pathology and Immunology, Monash University Medical School, Melbourne, Victoria, Australia 3181.
Vesicle transport requires the recruitment of cytosolic proteins to specific membrane compartments. We have previously characterised a brefeldin A-sensitive trans-Golgi network-localised protein (p230) that is associated with a population of non-clathrin-coated vesicles. p230 recycles between the cytosol and the cytoplasmic face of buds/vesicles of trans-Golgi network membranes in a G protein-regulated manner. Identifying the mechanism responsible for Golgi targeting of p230 is important for the elucidation of its function. By transfection of COS cells with deletion mutants of p230 we here demonstrate that the C-terminal domain is necessary for targeting to the Golgi. Furthermore, the C-terminal 98 amino acid domain of p230 attached to the green fluorescent protein (GFP-p230-C98aa) was efficiently Golgi-localised in transfected COS cells. Deletion mutants of GFP-p230-C98aa together with alanine scanning mutagenesis identified a minimum stretch of 42 amino acids that is essential for Golgi targeting, suggesting that the conformation of the domain is critical for efficient targeting. In COS cells expressing high levels of GFP-p230-C98aa fusion protein, endogenous p230 was no longer associated with Golgi membranes, suggesting that the GFP fusion protein and endogenous p230 may compete for the same membrane target structures. The Golgi binding of GFP-p230-C98aa is brefeldin A-sensitive and is regulated by G proteins. These studies have identified a minimal sequence responsible for specific targeting of p230 to the Golgi apparatus, which displays similar membrane binding characteristics to wild-type p230.
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