1. Interaction of chikungunya virus glycoproteins with macrophage factors controls virion production
- Author
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Yao, Zhenlan, Ramachandran, Sangeetha, Huang, Serina, Kim, Erin, Jami-Alahmadi, Yasaman, Kaushal, Prashant, Bouhaddou, Mehdi, Wohlschlegel, James A, and Li, Melody MH
- Subjects
Medical Microbiology ,Biomedical and Clinical Sciences ,Biological Sciences ,Vector-Borne Diseases ,Emerging Infectious Diseases ,Biodefense ,Infectious Diseases ,2.2 Factors relating to the physical environment ,2.1 Biological and endogenous factors ,Infection ,Good Health and Well Being ,Chikungunya virus ,Humans ,Macrophages ,Viral Envelope Proteins ,Virion ,Chikungunya Fever ,Glycoproteins ,Host-Pathogen Interactions ,Virus Replication ,THP-1 Cells ,Alphavirus E1 Glycoprotein ,Chikungunya Virus ,eIF3k ,Evolutionary Selection ,Macrophage ,Information and Computing Sciences ,Medical and Health Sciences ,Developmental Biology ,Biological sciences ,Biomedical and clinical sciences - Abstract
Despite their role as innate sentinels, macrophages can serve as cellular reservoirs of chikungunya virus (CHIKV), a highly-pathogenic arthropod-borne alphavirus that has caused large outbreaks among human populations. Here, with the use of viral chimeras and evolutionary selection analysis, we define CHIKV glycoproteins E1 and E2 as critical for virion production in THP-1 derived human macrophages. Through proteomic analysis and functional validation, we further identify signal peptidase complex subunit 3 (SPCS3) and eukaryotic translation initiation factor 3 subunit K (eIF3k) as E1-binding host proteins with anti-CHIKV activities. We find that E1 residue V220, which has undergone positive selection, is indispensable for CHIKV production in macrophages, as its mutation attenuates E1 interaction with the host restriction factors SPCS3 and eIF3k. Finally, we show that the antiviral activity of eIF3k is translation-independent, and that CHIKV infection promotes eIF3k translocation from the nucleus to the cytoplasm, where it associates with SPCS3. These functions of CHIKV glycoproteins late in the viral life cycle provide a new example of an intracellular evolutionary arms race with host restriction factors, as well as potential targets for therapeutic intervention.
- Published
- 2024