{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTRIM6 is a member of the tripartite motif (TRIM) family of E3-ubiquitin ligases that plays a key role in regulating innate immune responses. Its activity promotes the synthesis of unanchored K48‐linked polyubiquitin chains, which in turn activate IKKε and facilitate STAT1 phosphorylation and the induction of interferon‐stimulated genes, thereby contributing to an effective antiviral state."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the context of viral infections, several studies have revealed that TRIM6 not only assists in antiviral signaling but is also targeted or exploited by viruses to benefit their own replication. For instance, the matrix protein of Nipah virus (NiV-M) interacts with and promotes the degradation of TRIM6, blunting the host IFN-I response."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Similarly, Ebola virus VP35 can bind to TRIM6 and associate with unanchored polyubiquitin chains, impairing IKKε activation and thus inhibiting interferon induction."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " In addition, using chimeric protein analyses, domains derived from TRIM6 have been shown to substitute functionally for those in TRIM5α in restricting HIV-1"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ", and TRIM6 is important for optimal IFN-I signaling during West Nile virus infection, where its loss results in reduced phosphorylation of STAT1 via a mechanism involving VAMP8."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging evidence also implicates TRIM6 in the modulation of carcinogenesis. Although one study noted that the roles of TRIM6 in tumor development have received little attention"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ", subsequent research has demonstrated its pro-tumorigenic functions in multiple cancer types. In lung cancer, TRIM6 enhances tumor progression"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", while in breast cancer, TRIM6 overexpression increases YAP1 signaling by ubiquitination-mediated proteasomal degradation of STUB1, thereby promoting cellular proliferation and growth."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In gliomas, elevated TRIM6 levels correlate with poor patient prognosis; mechanistic studies suggest that TRIM6 regulates the FOXM1-VEGFA axis and modulates cytokine-cytokine receptor interactions leading to enhanced proliferation, migration, and angiogenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Additionally, in hepatocellular carcinoma, TRIM6 expression is linked with tumor progression."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its roles in antiviral immunity and cancer, TRIM6 is also implicated in noninfectious pathologies. In renal tubular epithelial cells, TRIM6 is involved in mediating oxidative stress-induced inflammasome activation and pyroptosis, suggesting a potential contribution to the progression of renal fibrosis and chronic kidney disease."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Furthermore, in the context of SARS-CoV-2 infection, TRIM6 catalyzes the K29-linked polyubiquitination of the viral nucleocapsid protein, a modification that enhances the protein’s ability to bind viral genomic RNA and thereby promotes efficient virus replication."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ricardo Rajsbaum, Gijs A Versteeg, Sonja Schmid, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Unanchored K48-linked polyubiquitin synthesized by the E3-ubiquitin ligase TRIM6 stimulates the interferon-IKKε kinase-mediated antiviral response."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Immunity (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.immuni.2014.04.018"}], "href": "https://doi.org/10.1016/j.immuni.2014.04.018"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "24882218"}], "href": "https://pubmed.ncbi.nlm.nih.gov/24882218"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Preeti Bharaj, Yao E Wang, Brian E Dawes, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The Matrix Protein of Nipah Virus Targets the E3-Ubiquitin Ligase TRIM6 to Inhibit the IKKε Kinase-Mediated Type-I IFN Antiviral Response."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS Pathog (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.ppat.1005880"}], "href": "https://doi.org/10.1371/journal.ppat.1005880"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "27622505"}], "href": "https://pubmed.ncbi.nlm.nih.gov/27622505"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Preeti Bharaj, Colm Atkins, Priya Luthra, et al. 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