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The degradation of nuclear pore components and disruption of nucleocytoplasmic trafficking during rhinovirus infection have been attributed to viral 2A protease. Here we show for the first time that rhinovirus 3C protease may also have a role. Specifically, we show that 3C and its precursor, 3CD, can target green fluorescent protein to the nucleus of living cells, leading to degradation of nuclear pore components, and that incubation with recombinant 3C disrupts active and passive nucleocytoplasmic transport in a semi-intact cell nuclear transport system dependent on 3C protease activity. 3C may thus contribute to host cell shutoff in infected cells by localizing in the nucleus and facilitating nuclear pore breakdown.

Rhinovirus 3C Protease Can Localize in the Nucleus and Alter Active and Passive Nucleocytoplasmic Transport