Alphaviral nonstructural protein-host RBP co-condensation as a mechanism to sustain virus replication
Liu, Y.; Yao, Z.; Chen, Q.; Yang, Z.; He, Y.; Chen, X.; Zhang, Y.; Du, J.; Wu, J.; Kim, H. J.; Zhu, Z.; Tian, L.; Wang, Z.; Huang, J.; Zhang, Y.; Fan, W.; Taylor, J. P.; Yang, P.
Show abstract
It has long been recognized that the intracellular replication of alphaviruses critically relies on several key host RBPs, including G3BP1/2 and FXR1/FXR2/FMR1, but how these RBPs modulate alphaviral replication and whether it would be possible to target these RBPs for antiviral treatment are less explored. Here, using SFV as a model, we report that SFV nsP3 exploits G3BP for its condensation and transforms antiviral stress granules into proviral nsP3-G3BP co-condensates. The gel-like co-condensates of nsP3 and G3BP enrich and protect viral genomic RNAs from host RNase degradation and serve as viral translational hubs to promote viral replication. The mode of nsP3-RBP co-condensation is prevalent across alphaviruses, and disruption of nsP3 condensates is an efficient antiviral approach. Thus, these findings uncover a general anti-alphavirus strategy based on the conserved reliance of nsP3-RBP co-condensation.
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