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Characterization and subcellular localization of Alongshan virus proteins
Yinghua Zhao1, Ping Wu1, Li Liu1
1College of Wildlife and Protected Area, Northeast Forestry University, Harbin, China.
Frontiers in Microbiology
|October 14, 2022
Summary
Alongshan virus (ALSV), a tick-borne flavivirus, infects host cells and alters cellular structures. Researchers identified viral protein locations and functions, revealing insights into segmented flavivirus pathogenesis.
Area of Science:
- Virology
- Cell Biology
- Molecular Biology
Background:
- Alongshan virus (ALSV) is a newly identified tick-borne virus within the Jingmenvirus group of the *Flaviviridae* family.
- ALSV is associated with human disease and possesses a segmented genome encoding multiple structural and non-structural proteins.
Purpose of the Study:
- To investigate the subcellular localization and functional roles of ALSV proteins within host cells.
- To understand the impact of ALSV protein expression on host cell morphology and organelle function.
Main Methods:
- Characterization of subcellular distribution of ALSV proteins using various cell lines.
- Analysis of viral protein co-localization with cellular markers, including endoplasmic reticulum (ER) markers like calnexin.
- Assessment of the effect of non-structural protein 1 (NSP1) expression on mitochondrial dynamics and mitophagy.
Main Results:
- ALSV proteins displayed diverse subcellular distributions across different cell types.
- Viral proteins induced morphological alterations in the endoplasmic reticulum (ER), with NSP2, VP1b, VP2, and VP4 co-localizing in the ER.
- VP4 exhibited unique nuclear transfer and co-localization with calnexin in HepG2 cells, independent of direct interaction.
- NSP1 expression significantly reduced mitochondrial quantity through mitophagy induction.
Conclusions:
- The study elucidates the subcellular localization and functional activities of ALSV proteins.
- Findings provide crucial insights into the cellular mechanisms underlying the pathogenesis of emerging segmented flaviviruses like ALSV.
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