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M207694200v1
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Papers In Press, published online ahead of print October 16, 2002
J. Biol. Chem, 10.1074/jbc.M207694200
Submitted on July 30, 2002
Revised on October 16, 2002
Accepted on October 16, 2002

Localization and function of SNAP-25 and VAMP-2 in functioning gastric parietal cells

Serhan Karvar, Xuebiao Yao, James M. Crothers . Jr, Yuechueng Liu, and John G. Forte

Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720

Corresponding Author: jforte{at}uclink.berkeley.edu

The synaptosomal associated protein of 25 kDa (SNAP-25) plays an important role in vesicle trafficking. Together with vesicle-associated membrane protein-2 (VAMP-2) and syntaxin, SNAP-25 forms a ternary complex implicated in docking and fusion of secretory vesicles with the plasma membrane during exocytosis. These so-called SNARE proteins are believed to regulate tubulovesicle trafficking and fusion during the secretory cycle of the gastric parietal cell. Here we examined the cellular localization and functional importance of SNAP-25 in parietal cell cultures. Adenoviral constructs were used to express SNAP-25 tagged with cyan-fluorescent protein (CFP-SNAP), VAMP-2 tagged with yellow-fluorescent protein (YFP-VAMP), and SNAP-25 in which the C-terminal 25 amino acids were deleted (SNAP-25 *181-206). Membrane fractionation experiments and fluorescent imaging showed that SNAP-25 is localized to the apical plasma membrane. Expression of the mutant SNAP-25 *181-226 inhibited the acid secretory response of parietal cells. Also SNAP *181-226 bound poorly in vitro with recombinant syntaxin-1 compared to wild type SNAP-25 indicating pairing between syntaxin 1 and SNAP-25 is required for parietal cell activation. Dual expression of CFP-SNAP and YFP-VAMP revealed a dynamic change in distribution associated with acid secretion: in resting cells SNAP-25 is at the apical plasma membrane and VAMP-2 is associated with cytoplasmic H,K-ATPase-rich tubulovesicles; after stimulation the two proteins co-localize on the apical plasma membrane. These data demonstrate the functional significance of SNAP-25 as a SNARE protein in the parietal cell, and show the dynamic stimulation-associated redistribution of VAMP-2 from H,K-ATPase-rich tubulovesicles to co-localize with SNAP-25 on the apical plasma membrane.


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