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Journal of Cell Science, Vol 112, Issue 22 4135-4142, Copyright © 1999 by Company of Biologists

JOURNAL ARTICLES

Yeast ER-Golgi v-SNAREs Bos1p and Bet1p differ in steady-state localization and targeting

D Ossipov, S Schroder-Kohne and HD Schmitt
Department of Molecular Genetics, Max-Planck-Institute for Biophysical Chemistry, D-37070 Gottingen, Germany.

Vesicle specific SNAP receptors (v-SNAREs) Bos1p and Bet1p are involved in targeting of anterograde vesicles between the endoplasmic reticulum (ER) and early Golgi of Saccharomyces cerevisiae. To analyze factors that influence the targeting of these proteins, alpha-factor tagged versions of Bos1p and Bet1p were employed. The alpha-factor can be cleaved off by the Kex2p protease as soon as the hybrid proteins reach the late Golgi compartment. The data obtained by monitoring of Kex2p cleavage, by immunofluorescence microscopy and cell fractionation showed that Bos1-alpha and Bet1-alpha have different cellular localization and dynamics. Bos1-alpha is an ER protein, which recycles between the Golgi and the ER in COPI-dependent manner. Bet1-alpha is an early Golgi protein and it does not change its localization under conditions when other recycling Golgi proteins can be trapped in the ER.
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© The Company of Biologists Ltd 1999