Greatly enhanced manganese-dependent phosphatidylinositol:myo-inositol exchange activity was observed when isolated, intact nerve-endings were incubated with the nucleotide, CMP, suggesting that the enzyme, CDP-diglyceride:inositol phosphatidyl transferase, catalyzes this exchange. CMP, at 10 microM, produced as much myo-[2-3H] inositol incorporation into phosphatidylinositol as did 1 mM. This CMP-stimulated exchange activity may reside on the plasma membrane.
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