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Open Access Research

Muscovy duck reovirus p10.8 protein localizes to the nucleus via a nonconventional nuclear localization signal

Dongchun Guo, Na Qiu, Wulin Shaozhou, Xiaofei Bai, Yilong He, Qingshan Zhang, Jian Zhao, Ming Liu* and Yun Zhang*

Author Affiliations

State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Harbin 150001, P R China

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Virology Journal 2014, 11:37  doi:10.1186/1743-422X-11-37

Published: 24 February 2014

Abstract

Background

It was previously report that the first open reading frame of Muscovy duck reocvirus S4 gene encodes a 95-amino-acid protein, designed p10.8, which has no sequence similarity to other known proteins. Its amino acid sequence offers no clues about its function.

Results

Subcellular localization and nuclear import signal of p10.8 were characterized. We found that p10.8 protein localizes to the nucleus of infected and transfected cells, suggesting that p10.8 nuclear localization is not facilitated by viral infection or any other viral protein. A functional non-canonical nuclear localization signal (NLS) for p10.8 was identified and mapped to N-terminus residues 1–40. The NLS has the ability to retarget a large cytoplasmic protein to the nucleus.

Conclusions

p10.8 imported into the nucleus might via a nonconventional signal nuclear signal.

Keywords:
Muscovy duck reocvirus; p10.8 protein; Nuclear localization signal