Immediate early protein IE1

UniProtKB accession:  P03169

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Plays an important role in transactivating viral early genes as well as activating its own promoter, probably by altering the viral chromatin structure (PubMed:17331553, PubMed:8876134, PubMed:23878222, PubMed:15572445, PubMed:26812545, PubMed:35138119). Expression of IE1 and IE2 proteins is critical for the establishment of lytic infection and reactivation from viral latency (By similarity). Disrupts PML-associated ND10 nuclear bodies by interfering with host PML and SP100 sumoylation thereby altering the regulation of type I and type II interferon-induced gene expression (PubMed:9151854, PubMed:15163746, PubMed:17367754, PubMed:10233977). Promotes efficient viral growth by interacting with and directing host SP100 to degradation, leading to enhanced acetylation level of histones (PubMed:21880768). In addition, functions in counteracting the host innate antiviral response. Inhibits the type I interferon pathway by directly interacting with and sequestrating host STAT2 (PubMed:18701593, PubMed:19812155, PubMed:16497831). Also targets type II interferon pathway by repressing IL6- and STAT3 target genes (PubMed:27387064). Repression of STAT3 genes is due to STAT3 nuclear accumulation and disruption of IL6-induced STAT3 phosphorylation by IE1 (By similarity). This repression is followed by phosphorylation and activation of STAT1 (PubMed:27387064). Inhibits host ISG transcription by sequestering host ISGF3 in a PML- and STAT2- binding dependent manner (PubMed:25812002). Alters host cell cycle progression, probably through its interaction with host E2F1 or RB1 that overcomes the RB1-mediated repression of E2F-responsive promoters (PubMed:8892909). May act as a E3 ubiquitin ligase targeting several host proteins including HES1 and SP100A for ubiquitination and subsequent proteasomal degradation (PubMed:28750047). Impairs the radial migration of immature neurons by downregulating Gap junction alpha-1 protein/GJA1 also via ubiquitination and degradation (PubMed:37097169).