| Autor: |
Makio T; Department of Cell Biology and Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada T6G 2H7., Zhang K; Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75235.; Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai 200031, China., Love N; Department of Cell Biology and Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada T6G 2H7., Mast FD; Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA 98101., Liu X; Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai 200031, China., Elaish M; Department of Cell Biology and Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada T6G 2H7., Hobman T; Department of Cell Biology and Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada T6G 2H7., Aitchison JD; Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA 98101.; Department of Pediatrics, University of Washington, Seattle, WA 98195.; Department of Biochemistry, University of Washington, Seattle, WA 98195., Fontoura BMA; Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX 75235., Wozniak RW; Department of Cell Biology and Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada T6G 2H7. |
| Abstrakt: |
The Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) accessory protein Orf6 works as an interferon antagonist, in part, by inhibiting the nuclear import activated p-STAT1, an activator of interferon-stimulated genes, and the export of the poly(A) RNA. Insight into the transport regulatory function of Orf6 has come from the observation that Orf6 binds to the nuclear pore complex (NPC) components: Rae1 and Nup98. To gain further insight into the mechanism of Orf6-mediated transport inhibition, we examined the role of Rae1 and Nup98. We show that Rae1 alone is not necessary to support p-STAT1 import or nuclear export of poly(A) RNA. Moreover, the loss of Rae1 suppresses the transport inhibitory activity of Orf6. We propose that the Rae1/Nup98 complex strategically positions Orf6 within the NPC where it alters FG-Nup interactions and their ability to support nuclear transport. In addition, we show that Rae1 is required for normal viral protein production during SARS-CoV-2 infection presumably through its role in supporting Orf6 function. |
