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Dyson Institute of Vision Research, Department of Ophthalmology, Department of Cell Biology and Anatomy, Cornell
University Medical College, New York 10021
The participation of nonmuscle myosins in
the transport of organelles and vesicular carriers along
actin filaments has been documented. In contrast, there
is no evidence for the involvement of myosins in the
production of vesicles involved in membrane traffic.
Here we show that the putative TGN coat protein p200 (Narula, N., I. McMorrow, G. Plopper, J. Doherty, K.S.
Matlin, B. Burke, and J.L. Stow. 1992. J. Cell Biol. 114:
1113-1124) is myosin II. The recruitment of myosin II
to Golgi membranes is dependent on actin and is regulated by G proteins. Using an assay that studies the release of transport vesicles from the TGN in vitro, we
provide functional evidence that p200/myosin is involved in the assembly of basolateral transport vesicles
carrying vesicular stomatitis virus G protein (VSVG)
from the TGN of polarized MDCK cells. The 50% reduced efficiency in VSVG vesicle release from the
TGN in vitro after depletion of p200/myosin II could be
reestablished to control levels by the addition of purified nonmuscle myosin II. Several inhibitors of the actin-stimulated ATPase activity of myosin specifically
inhibited the release of VSVG-containing vesicles from
the TGN.
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