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Nuclear-export-signal-dependent protein translocation of dUTPase encoded by Singapore grouper iridovirus

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Abstract

The dUTPase is a ubiquitous and crucial enzyme responsible for regulating cellular levels of dUTP. In the present study, the expression pattern and translocation of a dUTPase homolog encoded by Singapore grouper iridovirus (SGIV) were elucidated. The SGIV ORF049R encodes a dUTPase homolog, which is a peptide of 155 amino acids that contains five conserved motifs. The temporal expression pattern during infection in vitro revealed that the SGIV dUTPase was an early transcript. A leucine-rich nuclear export signal (NES) at the C-terminus was predicted using CBS Online Servers. Subcellular location analysis showed that SGIV dUTPase is a cytoplasmic protein. Site-direct mutagenesis by overlap extension-PCR indicated that the NES is crucial for the translocation of SGIV dUTPase from the nucleus to the cytoplasm. We have discovered for the first time that the NES-dependent translocation of dUTPase is different for SGIV than for members of other species, which depend on a nuclear localization signal. These results provide new insights into the pathogenesis of fish iridoviruses.

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Acknowledgments

This work was supported by grants from Chinese Academy of Sciences (KZCX2-YW-BR-08), National Basic Research Program of China (973) (2006CB101802), Natural Science Foundation of China (30930070, 30725027, 30700616) and National High Technology Development Program of China (863) (2006AA100306, 2006AA09Z445).

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Authors and Affiliations

  1. State Key Laboratory of Biocontrol, School of Life Sciences, SunYat-Sen (Zhongshan) University, 135 West Xingang Road, Guangzhou, 510275, People’s Republic of China

    Jie Gong, You-Hua Huang & Rong Zhang

  2. Key Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou, 510301, People’s Republic of China

    Xiao-Hong Huang & Qi-Wei Qin

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  1. Jie Gong
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  2. You-Hua Huang
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  3. Xiao-Hong Huang
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Correspondence to Qi-Wei Qin.

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Gong, J., Huang, YH., Huang, XH. et al. Nuclear-export-signal-dependent protein translocation of dUTPase encoded by Singapore grouper iridovirus. Arch Virol 155, 1069–1076 (2010). https://doi.org/10.1007/s00705-010-0684-2

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  • DOI: https://doi.org/10.1007/s00705-010-0684-2

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