Abstract
Highly purified tonoplast fractions isolated by preparative free-flow electrophoresis from hypocotyls of etiolated soybean (Glycine max L. (Merr.)) were examined by negative-staining electron microscopy, and many but not all vesicles were found to exhibit head and stalk structures resembling the 9-nm stalked F1 ATPase particles reported previously for Neurospora (Bowman et al., 1989, J. Biol. Chem. 264, 15606–15612). The structures show distinguishing characteristics similar to those for Neurospora. These include a cleft in the particle not exhibited by mitochondrial F1 ATPase and a tendency to disappear from the membrane when treated with nitrate plus Mg−2+-ATP-containing solutions. The position of the stalked ATPase structures, indicates that some of the tonoplast vesicles were oriented cytoplasmic side out whereas others were oriented cytoplasmic side in.
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The technical assistance of Keri Safranski and Dorothy Werderitsh is gratefully acknowledged. Electron-microscope facilities were provided through the Purdue University Electron Microscope Laboratory under the direction of Professor Charles Bracker. One of the authors (G.F.E.S.) was supported by the Bundesministerium für Forschung und Technologie.
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Morré, D.J., Liedtke, C., Brightman, A.O. et al. Head and stalk structures of soybean vacuolar membranes. Planta 184, 343–349 (1991). https://doi.org/10.1007/BF00195335
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DOI: https://doi.org/10.1007/BF00195335