Actin-based motility drives baculovirus transit to the nucleus and cell surface.

Actin-based motility drives baculovirus transit to the nucleus and cell surface.
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DOI:
10.1083/jcb.201001162
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发表时间:
2010-07-26
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Welch MD
Welch MD
中科院分区:
其他
文献类型:
--
作者:
Ohkawa T;Volkman LE;Welch MD

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This virus takes a less-travelled cytoskeletal road both to reach its replication site in the nucleus and to get back to the plasma membrane to escape the host cell. Most viruses move intracellularly to and from their sites of replication using microtubule-based mechanisms. In this study, we show that nucleocapsids of the baculovirus Autographa californica multiple nucleopolyhedrovirus undergo intracellular motility driven by actin polymerization. Motility requires the viral P78/83 capsid protein and the host Arp2/3 complex. Surprisingly, the virus directs two sequential and coordinated phases of actin-based motility. Immediately after cell entry, motility enables exploration of the cytoplasm and collision with the nuclear periphery, speeding nuclear entry and the initiation of viral gene expression. Nuclear entry itself requires transit through nuclear pore complexes. Later, after the onset of early gene expression, motility is required for accumulation of a subpopulation of nucleocapsids in the tips of actin-rich surface spikes. Temporal coordination of actin-based nuclear and surface translocation likely enables rapid transmission to neighboring cells during infection in insects and represents a distinctive evolutionary strategy for overcoming host defenses.
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