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The capsid protein of citrus leprosis virus C shows a nuclear distribution and interacts with the nucleolar fibrillarin protein.
Virus Research 2023 December 8
Brevipalpus-transmitted viruses (BTVs) have a significant negative economic impact on the citrus industry in Central and South America. Until now, only a few studies have explored the intracellular distribution and interaction of BTVs-encoded proteins with host factors, particularly for cileviruses, the main BTV responsible for the Citrus Leprosis (CL) disease. This study describes the nuclear localization of citrus leprosis virus C (CiLV-C) capsid protein (p29) and its interaction with the fibrillarin (Fib2) within the nucleolar compartment and cell cytoplasm. Our results, obtained by computer predictions and laser scanning confocal microscopy analyses, including colocalization and bimolecular fluorescence complementation (BiFC) approaches, revealed that a fraction of the p29 is localized in the nucleus and colocalizes with the Fib2 in both the nucleolus and cytosol. The nuclear localization of p29 correlated with a smaller nucleus size. Furthermore, co-immunoprecipitation (Co-IP) assays confirmed the interactions between p29 and Fib2. The implications of these findings for the functionalities of the cilevirus capsid protein are discussed.
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