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Yale University School of Medicine, Department of Cell Biology, New Haven, Connecticut 06520-8002
Herpes simplex virus 1 fuses with the plasma
membrane of a host cell, and the incoming capsids are
efficiently and rapidly transported across the cytosol to
the nuclear pore complexes, where the viral DNA genomes are released into the nucleoplasm. Using biochemical assays, immunofluorescence, and immunoelectron microscopy in the presence and absence of
microtubule depolymerizing agents, it was shown that
the cytosolic capsid transport in Vero cells was mediated by microtubules. Antibody labeling revealed the
attachment of dynein, a minus end-directed, microtubule-dependent motor, to the viral capsids. We propose
that the incoming capsids bind to microtubules and use
dynein to propel them from the cell periphery to the
nucleus.
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