Abstract
To demonstrate the relationship between protein-bodies in seeds and vacuoles in other tissues, we expressed the coding sequences of two bean (Phaseolus vulgaris L.) protein-body proteins in tobacco (Nicotiana tabacum L.). We chose phytohemagglutinin-L (PHA-L) and tonoplast intrinsic protein (TIP) as representatives of the protein-body contents and protein-body membrane, respectively. The location of the two proteins in the leaves of transgenic tobacco was examined by immunocytochemistry and in preparations of isolated vacuoles. Tonoplast intrinsic protein accumulates primarily in tonoplasts in tobacco leaves, whereas PHA is found exclusively in the vacuolar sap, showing that the signals that target proteins to protein-bodies and their limiting membranes in seeds are correctly recognized in leaves. This observation provides further evidence that proteinbodies of dicotyledonous seeds should be considered as protein-storage vacuoles.
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Abbreviations
- TIP:
-
tonoplast intrinsic protein
- PHA:
-
phytohemagglutinin
- SDS-PAGE:
-
sodium dodecyl sulfate-polyacrylamide gel electrophoresis
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This work has been supported by a grant from the U.S. Department of Agriculture Competitive Research Grants Office to Maarten J. Chrispeels. Herman Höfte is a recipient of a Postdoctoral Fellow-ship from the European Molecular Biology Organization. Craig Dickinson is a recipient of a National Institutes of Health Postdoctoral Fellowship. Loîc Faye was on leave from the Centre National de la Recherche Scientifique, UA203, Université de Rouen, Mont Saint Aignan France and supported by a cooperative CNRS — National S cience Foundation grant. The mention of vendor or product in this paper does not imply that they are endorsed or recommended by the U.S. Department of Agriculture over vendors of similar products not mentioned. We thank Jürgen Denecke for providing plasmid pDE1001, Antje von Schaewen for the plant expression cassette and Marie-Theres Hauser for the modified vacuole preparation protocol.
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Höfte, H., Faye, L., Dickinson, C. et al. The protein-body proteins phytohemagglutinin and tonoplast intrinsic protein are targeted to vacuoles in leaves of transgenic tobacco. Planta 184, 431–437 (1991). https://doi.org/10.1007/BF00197889
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DOI: https://doi.org/10.1007/BF00197889