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SARS-CoV-2 virulence factor ORF3a blocks lysosome function by modulating TBC1D5-dependent Rab7 GTPase cycle

Walia et al., Nature Communications, doi:10.1038/s41467-024-46417-2
Mar 2024  
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In Vitro study showing that SARS-CoV-2 ORF3a protein hyperactivates the Rab7 GTPase to block lysosomal degradation and promote viral replication. Authors found that the chemical compound CID-1067700, a Rab7 inhibitor, reduced SARS-CoV-2 replication in infected Vero E6 cells, while the Rab7 activator ML-098 enhanced viral replication. The results suggest that Rab7 hyperactivation by the viral ORF3a protein is beneficial for SARS-CoV-2, likely by preventing the degradation of viral components in lysosomes. Inhibiting Rab7 with CID-1067700 impaired viral replication, indicating Rab7 could be a potential therapeutic target.
Niclosamide was used as a positive control and showed the most potent inhibition of SARS-CoV-2 replication in this study.
8 preclinical studies support the efficacy of niclosamide for COVID-19:
Walia et al., 6 Mar 2024, peer-reviewed, 8 authors. Contact: atuli@imtech.res.in.
In Vitro studies are an important part of preclinical research, however results may be very different in vivo.
This PaperNiclosamideAll
Abstract: Article https://doi.org/10.1038/s41467-024-46417-2 SARS-CoV-2 virulence factor ORF3a blocks lysosome function by modulating TBC1D5dependent Rab7 GTPase cycle Received: 12 June 2023 Check for updates 1234567890():,; 1234567890():,; Accepted: 26 February 2024 Kshitiz Walia1,2, Abhishek Sharma1, Sankalita Paul3, Priya Chouhan1,2, Gaurav Kumar 1, Rajesh Ringe1, Mahak Sharma 3 & Amit Tuli 1,2 SARS-CoV-2, the causative agent of COVID-19, uses the host endolysosomal system for entry, replication, and egress. Previous studies have shown that the SARS-CoV-2 virulence factor ORF3a interacts with the lysosomal tethering factor HOPS complex and blocks HOPS-mediated late endosome and autophagosome fusion with lysosomes. Here, we report that SARS-CoV-2 infection leads to hyperactivation of the late endosomal and lysosomal small GTPbinding protein Rab7, which is dependent on ORF3a expression. We also observed Rab7 hyperactivation in naturally occurring ORF3a variants encoded by distinct SARS-CoV-2 variants. We found that ORF3a, in complex with Vps39, sequesters the Rab7 GAP TBC1D5 and displaces Rab7 from this complex. Thus, ORF3a disrupts the GTP hydrolysis cycle of Rab7, which is beneficial for viral production, whereas the Rab7 GDP-locked mutant strongly reduces viral replication. Hyperactivation of Rab7 in ORF3a-expressing cells impaired CIM6PR retrieval from late endosomes to the trans-Golgi network, disrupting the biosynthetic transport of newly synthesized hydrolases to lysosomes. Furthermore, the tethering of the Rab7- and Arl8b-positive compartments was strikingly reduced upon ORF3a expression. As SARS-CoV-2 egress requires Arl8b, these findings suggest that ORF3a-mediated hyperactivation of Rab7 serves a multitude of functions, including blocking endolysosome formation, interrupting the transport of lysosomal hydrolases, and promoting viral egress. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the agent responsible for coronavirus disease 2019 (COVID-19), is a positive sense single-stranded RNA virus belonging to the beta-coronavirus (β-CoV) genus. Positive-sense RNA viruses are known to modify endomembrane compartments to produce replication compartments (RCs). These RCs contain viral RNA and proteins, in addition to host proteins and lipids, and provide a barrier between viral replication and the host cytosol, which contains the viral RNA degradation machinery and innate immune sensors1,2. The viral particles formed from structural proteins assemble in the ER-Golgi intermediate compartment. Ultimately, virions transit in vesicles and undergo exocytosis via the biosynthetic secretory pathway3. Interestingly, another mechanism for extracellular release, in which virions reside in deacidified lysosomes that fuse with the plasma membrane has recently been reported for β-CoVs, including SARS-CoV-24. The genomic size of SARS-CoV-2 ranges from 29.8 kb to 29.9 kb, encompassing eleven genes with open reading frames (ORFs)5,6. The 5’ genomic region constitutes more than two-thirds of the genome and 1 Division of Cell Biology and Immunology, CSIR-Institute of Microbial Technology (IMTECH), Chandigarh, India. 2Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India. 3Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, e-mail: atuli@imtech.res.in Punjab, India. Nature Communications | (2024)15:2053 1 Article encodes the ORF1ab polyproteins. In..
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Previous studies have shown ' 'that the SARS-CoV-2 virulence factor ORF3a interacts with the lysosomal tethering factor HOPS ' 'complex and blocks HOPS-mediated late endosome and autophagosome fusion with lysosomes. Here, ' 'we report that SARS-CoV-2 infection leads to hyperactivation of the late endosomal and ' 'lysosomal small GTP-binding protein Rab7, which is dependent on ORF3a expression. We also ' 'observed Rab7 hyperactivation in naturally occurring ORF3a variants encoded by distinct ' 'SARS-CoV-2 variants. We found that ORF3a, in complex with Vps39, sequesters the Rab7 GAP ' 'TBC1D5 and displaces Rab7 from this complex. Thus, ORF3a disrupts the GTP hydrolysis cycle of ' 'Rab7, which is beneficial for viral production, whereas the Rab7 GDP-locked mutant strongly ' 'reduces viral replication. 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