Abstract
Multi-vesicular bodies in endocytosis and protoplasts are special cellular structures that are considered to be originated from invagination of plasma membranes. However, the genesis and function of multi-vesicular bodies, the relationship with Golgi bodies and cell walls, and their secretory pathways remain controversial and ambiguous. Using a monoclonal antibody against an animal 58K protein, we have detected, by Western blotting and confocal microscopy, that a 58K-like protein is present in the calli of Arabidopsis thaliana and Hypericum perforatum. The results of immuno-electron microscopy showed that the 58K-like protein was located in the cisternae of Golgi bodies, secretory vesicles, multi-vesicular bodies, cell walls and vacuoles in callus of Arabidopsis thaliana, suggesting that the multi-vesicular bodies may be originated from Golgi bodies and function as a transporter carrying substances synthesized in Golgi bodies to cell walls and vacuoles. It seems that multi-vesicular bodies have a close relationship with the development of the cell wall and vacuole. The possible secretory pathways of multi-vesicular bodies might be in exocytosis, in which multi-vesicular bodies carry substances to the cell wall for its construction, and in endocytosis, in which multi-vesicular bodies carry substances to the vacuole for its development, depending on what they carry and where the materials are transported. We hence propose that there is more than one pathway for the secretion of multi-vesicular bodies. In addition, our results provided a paradigm that a plant molecule, such as the 58k-like protein in callus of Arabidopsis thaliana, can be detected using a cross-reactive monoclonal antibody induced by an animal protein, and illustrate the existence of analog molecules in both animal and plant kingdoms.
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Supported by the National Natural Science Foundation of China (Grant No. 30470863)
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Xu, S., Qian, J., Song, X. et al. Localization and secretory pathways of a 58K-like protein in multi-vesicular bodies in callus of Arabidopsis thaliana. SCI CHINA SER C 51, 827–832 (2008). https://doi.org/10.1007/s11427-008-0112-y
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DOI: https://doi.org/10.1007/s11427-008-0112-y