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* Lehrstuhl für Entwicklungsgenetik, Universität Tübingen, D-72076 Tübingen, Federal Republic of Germany; In higher plant cytokinesis, plasma membrane and cell wall originate by vesicle fusion in the
plane of cell division. The Arabidopsis KNOLLE gene,
which is required for cytokinesis, encodes a protein related to vesicle-docking syntaxins. We have raised specific rabbit antiserum against purified recombinant
KNOLLE protein to show biochemically and by immunoelectron microscopy that KNOLLE protein is membrane associated. Using immunofluorescence microscopy, KNOLLE protein was found to be specifically
expressed during mitosis and, unlike the plasma membrane H+-ATPase, to localize to the plane of division
during cytokinesis. Arabidopsis dynamin-like protein
ADL1 accumulates at the plane of cell plate formation
in knolle mutant cells as in wild-type cells, suggesting
that cytokinetic vesicle traffic is not affected. Furthermore, electron microscopic analysis indicates that vesicle fusion is impaired. KNOLLE protein was detected
in mitotically dividing cells of various parts of the developing plant, including seedling root, inflorescence
meristem, floral meristems and ovules, and the cellularizing endosperm, but not during cytokinesis after the
male second meiotic division. Thus, KNOLLE is the
first syntaxin-like protein that appears to be involved
specifically in cytokinetic vesicle fusion.
Max-Planck-Institut für Entwicklungsbiologie, D-72076 Tübingen, Federal Republic of Germany; and § Plant Molecular Biology
and Biotechnology Research Center, Gyeongsang National University, Chinju, 660-701, Korea
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