Epstein-Barr nuclear antigen 1

UniProtKB accession:  Q3KSS4

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Responsible for the origin of replication (oriP) dependent replication and maintenance of viral episomes during latent infection. EBNA1 dimer interacts with the DS (dyad symmetry) element within the origin of replication oriP and with a host mitotic chromosome to initiate viral DNA replication during latency. EBNA1 binding to DS recruits the host origin recognition complex (ORC). Governs the faithful mitotic segregation of the viral episomes by binding both the FR (family of repeats) element within oriP and the host mitotic chromosomes. Forms a cell cycle-dependent tyrosine-dependent DNA cross-link and single-strand cleavage at oriP required for terminating replication and maintaining viral episomes. Counteracts the stabilization of host p53/TP53 by host USP7, thereby decreasing apoptosis and increasing host cell survival. Induces degradation of host PML through the ubiquitin-proteasome system, which promotes lytic reactivation and may impair the host cell DNA repair. Increases the association of CK2 with PML proteins which increases the phosphorylation of PML proteins by CK2, triggering the polyubiquitylation and degradation of PML. Displays inhibitory effects on a SUMO2-modified complex that includes STUB1, KAP1 and USP7. This inhibitory effect possibly participates to the maintenance of latency linked to PML silencing.