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Stimulation of Phosphatidylethanolamine Exchange by Castor Bean Cytosol Proteins ¹

Université Pierre et Marie Curie, Laboratoire Physiologie Cellulaire (ERA 323), 4 Place Jussieu, 75005 Paris, France

Cytosol proteins prepared from castor bean endosperm (4-day-old) seedlings stimulate the exchange of [³H]phosphatidylethanolamine between liposomes and mitochondria. The acceleration of the exchange depends on the quantity of cytosol proteins, the time of incubation, and the respective amounts of liposomes and mitochondria. On a per seedling basis, the active proteins are essentially located in the endosperm, whereas the roots and the cotyledons are less rich in these proteins.