1
|
Hu X, Tian L, Li J, Zhou Y, Chen X, Mu J, Bai H, Zhang Y, Wang Y. Effects of CRM1-dependent nuclear export inhibition on viral structural protein nuclear accumulation during Autographa californica multiple nucleopolyhedrovirus infection. Virus Res 2021; 303:198504. [PMID: 34271037 DOI: 10.1016/j.virusres.2021.198504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 06/28/2021] [Accepted: 07/06/2021] [Indexed: 11/16/2022]
Abstract
Autographa californica multiple nucleopolyhedrovirus (AcMNPV) assembles its nucleocapsids and occlusion-derived virions (ODVs) in the nucleus, which requires AcMNPV regulation for viral structural proteins to accumulate in the nucleus during its replication in cells. It is generally accepted that the nuclear import receptor plays a predominant role in this process. CRM1 is a nuclear export receptor that forms an export complex with its cargo protein to exit the nucleus. We previously discovered that AcMNPV inhibited CRM1-dependent nuclear export by the viral protein Ac34. This finding suggested that Ac34 could sequester CRM1-dependent proteins in the nucleus and play a novel role in the nuclear accumulation of viral structural proteins. Using the CRM1 inhibitor leptomycin B (LMB), we demonstrated that CRM1 inhibition promoted AcMNPV replication, as LMB treatment readily increased the virus titer, and even functionally surrogate Ac34 to rescue the infectivity of an ac34-knockout virus. To elucidate whether CRM1 inhibition contributes to the nuclear accumulation of viral structural proteins, we systematically analyzed the impact of CRM1 inhibition on viral protein spatial distribution patterns. We found that the nucleocapsid protein Ac102 and ODV envelope protein E26 were retained in the nucleus in response to CRM1 inhibition by Ac34. This finding indicates that AcMNPV is evolving to simultaneously exploit bidirectional nucleocytoplasmic trafficking to assist in viral replication.
Collapse
Affiliation(s)
- Xue Hu
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China
| | - Lingqian Tian
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China; University of Chinese Academy of Sciences, Beijing, China
| | - Jingqi Li
- Department of Basic Medicine and Forensic Medicine, Baotou Medical College, Baotou, China
| | - Yuan Zhou
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China
| | - Xinwen Chen
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China
| | - Jingfang Mu
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China
| | - Huimin Bai
- University of Chinese Academy of Sciences, Beijing, China
| | - Yongli Zhang
- Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China; Sino-Africa Joint Research Center, Chinese Academy of Sciences, Wuhan, China.
| | - Yun Wang
- State Key Laboratory of Virology, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, China.
| |
Collapse
|