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https://doi.org/10.1186/s12977-015-0197-x
Title: | Evidence that the endosomal sorting complex required for transport-II (ESCRT-II) is required for efficient human immunodeficiency virus-1 (HIV-1) production | Authors: | Meng, B Ip, N.C.Y Prestwood, L.J Abbink, T.E.M Lever, A.M.L |
Keywords: | ESCRT I protein ESCRT II protein ESCRT III protein ESCRT protein Gag protein unclassified drug ESCRT protein protein binding small interfering RNA Article controlled study CRISPR Cas system Human immunodeficiency virus 1 nonhuman protein protein interaction virion virus mutant virus release cell line gene inactivation genetics human Human immunodeficiency virus 1 metabolism mutation physiology protein tertiary structure transport at the cellular level Human immunodeficiency virus 1 Biological Transport Cell Line CRISPR-Cas Systems Endosomal Sorting Complexes Required for Transport gag Gene Products, Human Immunodeficiency Virus Gene Knockout Techniques HIV-1 Humans Mutation Protein Binding Protein Structure, Tertiary RNA, Small Interfering Virion Virus Release |
Issue Date: | 2015 | Citation: | Meng, B, Ip, N.C.Y, Prestwood, L.J, Abbink, T.E.M, Lever, A.M.L (2015). Evidence that the endosomal sorting complex required for transport-II (ESCRT-II) is required for efficient human immunodeficiency virus-1 (HIV-1) production. Retrovirology 12 (1) : 72. ScholarBank@NUS Repository. https://doi.org/10.1186/s12977-015-0197-x | Rights: | Attribution 4.0 International | Abstract: | Background: Egress of a number of different virus species from infected cells depends on proteins of the endosomal sorting complexes required for transport (ESCRT) pathway. HIV has also hijacked this system to bud viruses outward from the cell surface. How ESCRT-I activates ESCRT-III in this process remains unclear with conflicting published evidence for the requirement of ESCRT-II which fulfils this role in other systems. We investigated the role of ESCRT-II using knockdown mediated by siRNA and shRNA, mutants which prevent ESCRT-I/ESCRT-II interaction and a CRISPR/Cas9 EAP45 knockout cell line. Results: Depletion or elimination of ESCRT-II components from an HIV infected cell produces two distinct effects. The overall production of HIV-1 Gag is reduced leading to a diminished amount of intracellular virion protein. In addition depletion of ESCRT-II produces an effect similar to that seen when ESCRT-I and -III components are depleted, that of a delayed Gag p26 to p24 +p2 cleavage associated with a reduction in export of virion particles and a visible reduction in budding efficiency in virus producing cells. Mutants that interfere with ESCRT-I interacting with ESCRT-II similarly reduce virus export. The export defect is independent of the decrease in overall Gag production. Using a mutant virus which cannot use the ALIX mediated export pathway exacerbates the decrease in virus export seen when ESCRT-II is depleted. ESCRT-II knockdown does not lead to complete elimination of virus release suggesting that the late domain role of ESCRT-II is required for optimal efficiency of viral budding but that there are additional pathways that the virus can employ to facilitate this. Conclusion: ESCRT-II contributes to efficient HIV virion production and export by more than one pathway; both by a transcriptional or post transcriptional mechanism and also by facilitating efficient virus export from the cell through interactions with other ESCRT components. © 2015 Meng et al. | Source Title: | Retrovirology | URI: | https://scholarbank.nus.edu.sg/handle/10635/180900 | ISSN: | 17424690 | DOI: | 10.1186/s12977-015-0197-x | Rights: | Attribution 4.0 International |
Appears in Collections: | Elements Staff Publications |
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