FUNCTION: Major E3 ligase for ISG15 conjugation. Acts as a positive regulator of innate antiviral response in cells induced by interferon. Functions as part of the ISGylation machinery that recognizes target proteins in a broad and relatively non-specific manner. Catalyzes ISGylation of IRF3 which r...
FUNCTION: Major E3 ligase for ISG15 conjugation. Acts as a positive regulator of innate antiviral response in cells induced by interferon. Functions as part of the ISGylation machinery that recognizes target proteins in a broad and relatively non-specific manner. Catalyzes ISGylation of IRF3 which results in sustained activation, it attenuates IRF3-PIN1 interaction, which antagonizes IRF3 ubiquitination and degradation, and boosts the antiviral response. Catalyzes ISGylation of influenza A viral NS1 which attenuates virulence; ISGylated NS1 fails to form homodimers and thus to interact with its RNA targets. Catalyzes ISGylation of papillomavirus type 16 L1 protein which results in dominant-negative effect on virus infectivity. Physically associated with polyribosomes, broadly modifies newly synthesized proteins in a cotranslational manner. In an interferon-stimulated cell, newly translated viral proteins are primary targets of ISG15. {ECO:0000269|PubMed:16407192, ECO:0000269|PubMed:16815975, ECO:0000269|PubMed:16884686, ECO:0000269|PubMed:20133869, ECO:0000269|PubMed:20308324, ECO:0000269|PubMed:20385878, ECO:0000269|PubMed:20542004}.
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GO - Biological processes (BP):
defense response to virus [GO:0051607]; innate immune response [GO:0045087]; ISG15-protein conjugation [GO:0032020]; protein ubiquitination [GO:0016567]; regulation of cyclin-dependent protein serine/threonine kinase activity [GO:0000079]; regulation of defense response to virus [GO:0050688]...
defense response to virus [GO:0051607]; innate immune response [GO:0045087]; ISG15-protein conjugation [GO:0032020]; protein ubiquitination [GO:0016567]; regulation of cyclin-dependent protein serine/threonine kinase activity [GO:0000079]; regulation of defense response to virus [GO:0050688]
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GO - Molecular function (MF):
cyclin binding [GO:0030332]; ISG15 transferase activity [GO:0042296]; RNA binding [GO:0003723]; ubiquitin protein ligase activity [GO:0061630]; ubiquitin-protein transferase activity [GO:0004842]...
cyclin binding [GO:0030332]; ISG15 transferase activity [GO:0042296]; RNA binding [GO:0003723]; ubiquitin protein ligase activity [GO:0061630]; ubiquitin-protein transferase activity [GO:0004842]
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GO - Cellular component (CC):
cytoplasm [GO:0005737]; cytosol [GO:0005829]; perinuclear region of cytoplasm [GO:0048471]...
cytoplasm [GO:0005737]; cytosol [GO:0005829]; perinuclear region of cytoplasm [GO:0048471]
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