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THE PLANT CELL, Vol 9, Issue 4 571-582, Copyright © 1997 by American Society of Plant Biologists
The Syntaxin Homolog AtPEP12p Resides on a Late Post-Golgi Compartment in Plants
AdS. Conceicao, D. Marty-Mazars, D. C. Bassham, A. A. Sanderfoot, F. Marty and N. V. Raikhel
Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824-1312
Soluble proteins are transported to the plant vacuole through the secretory
pathway via membrane-bound vesicles. Targeting of vesicles to appropriate
organelles requires several membrane-bound and soluble factors that have
been characterized in yeast and mammalian systems. For example, the yeast
PEP12 protein is a syntaxin homolog that is involved in protein transport
to the yeast vacuole. Previously, we isolated an Arabidopsis thaliana
homolog of PEP12 by functional complementation of the yeast pep12 mutant.
Antibodies raised against the cytoplasmic portion of AtPEP12 have been
prepared and used for intracellular localization of this protein.
Biochemical analysis indicates that AtPEP12 does not localize to the
endoplasmic reticulum, Golgi apparatus, plasma membrane, or tonoplast in
Arabidopsis plants; furthermore, based on biochemical and electron
microscopy immunogold labeling analyses, AtPEP12 is likely to be localized
to a post-Golgi compartment in the vacuolar pathway.
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