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• W2904865648 abstract "Insulin-induced gene 1 (INSIG1) regulates sterol synthesis by mediating the activation of sterol regulatory element–binding protein (SREBP) and the degradation of the HMG-CoA reductase (HMGCR). INSIG1 is up-regulated during HIV-1 infection, but its role in HIV-1 infection is unknown. In this report, using pseudovirus production, protein overexpression, and gene knockouts, we found that INSIG1 inhibits HIV-1 production by accelerating the degradation of the HIV-1 Gag protein. Unlike the degradation of HMGCR via the E3 ubiquitin ligase autocrine motility factor receptor (AMFR), a process that depends on the proteasome, INSIG1 coordinated with another ligase, translocation in renal carcinoma chromosome 8 (TRC8), and promoted Gag degradation through the lysosome pathway. We conclude that INSIG1 functions as a sentinel responsive to HIV-1 production and inhibits HIV-1 replication by degrading Gag, a process occurring at intracellular membrane sites such as the endoplasmic reticulum and endosomes where both INSIG1 and Gag may be located. Insulin-induced gene 1 (INSIG1) regulates sterol synthesis by mediating the activation of sterol regulatory element–binding protein (SREBP) and the degradation of the HMG-CoA reductase (HMGCR). INSIG1 is up-regulated during HIV-1 infection, but its role in HIV-1 infection is unknown. In this report, using pseudovirus production, protein overexpression, and gene knockouts, we found that INSIG1 inhibits HIV-1 production by accelerating the degradation of the HIV-1 Gag protein. Unlike the degradation of HMGCR via the E3 ubiquitin ligase autocrine motility factor receptor (AMFR), a process that depends on the proteasome, INSIG1 coordinated with another ligase, translocation in renal carcinoma chromosome 8 (TRC8), and promoted Gag degradation through the lysosome pathway. We conclude that INSIG1 functions as a sentinel responsive to HIV-1 production and inhibits HIV-1 replication by degrading Gag, a process occurring at intracellular membrane sites such as the endoplasmic reticulum and endosomes where both INSIG1 and Gag may be located." @default.
• W2904865648 created "2018-12-22" @default.
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• W2904865648 date "2019-02-01" @default.
• W2904865648 modified "2023-10-17" @default.
• W2904865648 title "Insulin-induced gene 1 (INSIG1) inhibits HIV-1 production by degrading Gag via activity of the ubiquitin ligase TRC8" @default.
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• W2904865648 doi "https://doi.org/10.1074/jbc.ra118.004630" @default.
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