Beet black scorch virus (BBSV) is a positive-sense, single-stranded RNA virus belonging to Necrovirus genus. In order to better understand the life cycle of BBSV, we have investigated the subcellular localization of BBSV capsid protein (CP) by its fusion with green fluorescent protein (GFP) agroinfiltrated into Nicotiana benthamiana leaves and by particle bombardment into onion (Allium cepa) epidermal cells. Confocal laser scanning microscopy (CLSM) showed that BBSV CP fused to GFP displayed enhanced fluorescence in nuclei and nuclear import of the CP was confirmed in BBSV-infected N. benthamiana leaves. Mutational analysis revealed that the N-terminal basic amino acid cluster (4)KRNKGGKKSR(13) of the CP is essential for nuclear localization. Bimolecular fluorescence complementation (BiFC) assays indicated that the CP could interact with the nuclear import factor importin α, suggesting that the CP is possibly imported into the nucleus via an importin α-dependent pathway. This is the first report of the nuclear localization of the CP encoded by a necrovirus.
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