Abstract
The fusion of post-Golgi transport vesicles with the plasma membrane is perhaps the least well understood step in the network of intracellular membrane traffic. We have used an 'in vitro' system to study this membrane-fusion event. We show here that fusion requires the presence of cytosolic proteins, but not Ca2+, and is inhibited by the non-hydrolysable GTP analogue guanosine 5'-[gamma-thio]triphosphate, which indicates the involvement of a GTP-binding protein.
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