1887

Abstract

Adenoviruses are non-enveloped DNA viruses that replicate in the nucleus of infected cells. One of the core proteins, named pVIII, is a minor capsid protein connecting the core with the inner surface of the capsid. Here, we report the characterization of minor capsid protein pVIII encoded by the L6 region of bovine adenovirus (BAdV)-3. Anti-pVIII serum detected a 24 kDa protein at 12–48 h post-infection and an additional 8 kDa protein at 24–48 h post-infection. While the 24 kDa protein was detected in empty capsids, only the C-terminal-cleaved 8 kDa protein was detected in the mature virion, suggesting that amino acids147–216 of the conserved C-terminus of BAdV-3 pVIII are incorporated in mature virions. Detection of hexon protein associated with both precursor (24 kDa) and cleaved (8 kDa) forms of pVIII suggest that the C-terminus of pVIII interacts with the hexon. The pVIII protein predominantly localizes to the nucleus of BAdV-3-infected cells utilizing the classical importin α/β dependent nuclear import pathway. Analysis of mutant pVIII demonstrated that amino acids 52–72 of the conserved N-terminus bind to importin α-3 with high affinity and are required for the nuclear localization.

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2014-08-01
2019-11-19
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