Abstract
We studied fusion of negatively charged artificial phospholipid vesicles (liposomes) in the presence of two electrophoretic fractions (molecular mass of about 90 and 50 kdalton) of latrotoxin-like (L) protein. It was shown that both fractions are capable of causing liposome fusion in acidic media. Treatment of native preparations of L protein with NEM depressed their fusogenic activity. Some common characteristics of L protein and well-known fusogenic proteins allow us to account for the possibility of participation of L protein in fusion of the membranes in the cell.
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