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Rana grylio virus (RGV) 50L is associated with viral matrix and exhibited two distribution patterns
Xiao-Ying Lei1, Tong Ou, Qi-Ya Zhang
1State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Wuhan, China.
Background:
The complete genome of Rana grylio virus (RGV) was sequenced and analyzed recently, which revealed that RGV 50 L had homologues in many iridoviruses with different identities; however, the characteristics and functions of 50 L have not been studied yet.
Methodology/Principal Findings:
We cloned and characterized RGV50L, and revealed 50 L functions in virus assembly and gene regulation. 50 L encoded a 499-amino acid structural protein of about 85 kDa in molecular weight and contained a nuclear localization signal (NLS) and a helix- extension-helix motif. Drug inhibition assay demonstrated that 50 L was an immediate-early (IE) gene. Immuno-fluorescence assay revealed that 50 L appeared early and persisted in RGV-infected cells following two distribution patterns. One pattern was that 50 L exhibited a cytoplasm-nucleus- viromatrix distribution pattern, and mutagenesis of the NLS motif revealed that localization of 50 L in the nucleus was NLS-dependent; the other was that 50 L co-localized with viral matrix which plays important roles in virus assembly and the life circle of viruses.
Conclusions/Significance:
RGV 50L is a novel iridovirus IE gene encoded structural protein which plays important roles in virus assembly.
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