Summary
The process of formation from endoplasmic reticulum and transfer to Golgi apparatus of small 50–70 nm transition vesicles has been reconstituted in a cell-free system. Fractions enriched in transition elements derived from part-rough, part-smooth transitional regions of the endoplasmic reticulum were prepared from elongation zones of hypocotyls of etiolated seedlings of soybean and coleoptiles of maize and were compared with those from rat liver. When activated with nucleoside triphosphate, cytosol and an ATP regenerating system, time- and temperature-dependent transfer of membranes to Golgi apparatus acceptor was demonstrated. The fractions enriched in transition elements were radioiodinated with125I by the Bolton-Hunter procedure. Acceptor Golgi apparatus stacks were immobilized to nitrocellulose strips to facilitate analysis. In heterologous transfer experiments, the plant and animal acceptors and donors could be interchanged. The transfer was limited primarily by the donor (rat liver > soybean hypocotyl > maize coleoptiles) and determined secondarily by the source of the acceptor. The acceptor fractions were most efficacious when prepared from the same source as the donor. Thus, 50–70 nm vesicles bud from transitional endoplasmic reticulum elements of plants function in a manner similar to those of animal cells to transfer membrane materials to the Golgi apparatus. The recognition signals that determine vesicle fusion appear to be conserved both among species and between the plant and animal kingdoms to the extent that donor and acceptor sources may be interchanged with only small reductions in overall efficiency of transfer.
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Abbreviations
- HEPES:
-
N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- EDTA:
-
ethylenediaminetetraacetic acid
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Morré, D.J., Nowack, D.D., Paulik, M. et al. Transitional endoplasmic reticulum membranes and vesicles isolated from animals and plants. Protoplasma 153, 1–13 (1989). https://doi.org/10.1007/BF01322459
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DOI: https://doi.org/10.1007/BF01322459