Dynamics of Chikungunya Virus Cell Entry Unraveled by Single-Virus Tracking in Living Cells

Journal of Virology
Tabitha E HoornwegJolanda M Smit

Abstract

Chikungunya virus (CHIKV) is a rapidly emerging mosquito-borne human pathogen causing major outbreaks in Africa, Asia, and the Americas. The cell entry pathway hijacked by CHIKV to infect a cell has been studied previously using inhibitory compounds. There has been some debate on the mechanism by which CHIKV enters the cell: several studies suggest that CHIKV enters via clathrin-mediated endocytosis, while others show that it enters independently of clathrin. Here we applied live-cell microscopy and monitored the cell entry behavior of single CHIKV particles in living cells transfected with fluorescent marker proteins. This approach allowed us to obtain detailed insight into the dynamic events that occur during CHIKV entry. We observed that almost all particles fused within 20 min after addition to the cells. Of the particles that fused, the vast majority first colocalized with clathrin. The average time from initial colocalization with clathrin to the moment of membrane fusion was 1.7 min, highlighting the rapidity of the cell entry process of CHIKV. Furthermore, these results show that the virus spends a relatively long time searching for a receptor. Membrane fusion was observed predominantly from within Rab5-positive endosom...Continue Reading

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