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Proximity labeling of host factor ANXA3 in HCV infection reveals a novel LARP1 function in viral entry
Institute of Virology, Philipps-University Marburg, Marburg, Germany.
Section Mass Spectrometry and Proteomics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
Institute of Virology, Philipps-University Marburg, Marburg, Germany.
Institute of Virology, Philipps-University Marburg, Marburg, Germany.
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2024 (English)In: Journal of Biological Chemistry, ISSN 0021-9258, E-ISSN 1083-351X, Vol. 300, no 5, article id 107286Article in journal (Refereed) Published
Abstract [en]

Hepatitis C virus (HCV) infection is tightly connected to the lipid metabolism with lipid droplets (LDs) serving as assembly sites for progeny virions. A previous LD proteome analysis identified annexin A3 (ANXA3) as an important HCV host factor that is enriched at LDs in infected cells and required for HCV morphogenesis. To further characterize ANXA3 function in HCV, we performed proximity labeling using ANXA3-BioID2 as bait in HCV-infected cells. Two of the top proteins identified proximal to ANXA3 during HCV infection were the La-related protein 1 (LARP1) and the ADP ribosylation factor-like protein 8B (ARL8B), both of which have been previously described to act in HCV particle production. In follow-up experiments, ARL8B functioned as a pro-viral HCV host factor without localizing to LDs and thus likely independent of ANXA3. In contrast, LARP1 interacts with HCV core protein in an RNA-dependent manner and is translocated to LDs by core protein. Knockdown of LARP1 decreased HCV spreading without altering HCV RNA replication or viral titers. Unexpectedly, entry of HCV particles and E1/E2-pseudotyped lentiviral particles was reduced by LARP1 depletion, whereas particle production was not altered. Using a recombinant vesicular stomatitis virus (VSV)ΔG entry assay, we showed that LARP1 depletion also decreased entry of VSV with VSV, MERS, and CHIKV glycoproteins. Therefore, our data expand the role of LARP1 as an HCV host factor that is most prominently involved in the early steps of infection, likely contributing to endocytosis of viral particles through the pleiotropic effect LARP1 has on the cellular translatome.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 300, no 5, article id 107286
Keywords [en]
Hepatitis C virus (HCV), host-pathogen interaction, lipid droplets, proteomics, proximity labeling, virus entry
National Category
Microbiology in the medical area
Identifiers
URN: urn:nbn:se:umu:diva-225955DOI: 10.1016/j.jbc.2024.107286ISI: 001345614500001PubMedID: 38636657Scopus ID: 2-s2.0-85192670056OAI: oai:DiVA.org:umu-225955DiVA, id: diva2:1868629
Funder
German Research Foundation (DFG)Available from: 2024-06-12 Created: 2024-06-12 Last updated: 2025-04-24Bibliographically approved

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Gerold, Gisa

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