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Journal of Cell Science, Vol 110, Issue 11 1299-1306, Copyright © 1997 by Company of Biologists
JOURNAL ARTICLES |
Y Wada, N Nakamura, Y Ohsumi and A Hirata
Department of Biology, Graduate School of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Japan. cywada@komaba.ecc.u-tokyo.ac.jp
Syntaxins are thought to participate in the specific interactions between vesicles and acceptor membranes in intracellular protein trafficking. VAM3 of Saccharomyces cerevisiae encodes a 33 kDa protein (Vam3p) with a hydrophobic transmembrane segment at its C terminus. Vam3p has structural similarities to syntaxins of yeast, animal and plant cells. delta vam3 cells accumulated spherical structures of 200-600 nm in diameter, but lacked normal large vacuolar compartments. Loss of function of Vam3p resulted in inefficient processing of vacuolar proteins proteinase A, proteinase B and carboxypeptidase Y, and defective maturation of alkaline phosphatase. Subcellular fractionation and immunofluorescence microscopy showed that Vam3p was localized to the vacuolar membranes. Vam3p was accumulated in certain regions of the vacuolar membranes. We conclude from these observations that Vam3p is a novel member of syntaxin in the vacuoles and it provides the t-SNARE function in a late step of the vacuolar assembly.
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