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Acts as a novel regulator of senescence. Involved in the formation of senescence-associated heterochromatin foci (SAHF), which represses expression of proliferation-promoting genes. Binds to proliferation-promoting genes. May be required for replication-independent chromatin assembly.
Gene References into Functions
study points to UBN1 as the determinant of H3.3-specific binding and deposition by the HIRA histone chaperone complex. PMID: 26159857
a 184-amino acid region (from amino acids 39 to 223) at the N-terminal region of Ubn-1 was responsible for the interaction with the PDZ2 domain of ZO-1 PMID: 22245583
By a chromatin immunoprecipitation (ChIP) assay, the authors show that Ubn-1 blocks EB1-human herpesvirus 4 DNA interaction. PMID: 21084479
Analyses have revealed that in most cells ubinuclein occurred in the nucleoplasm, but in cells forming tight junctions it is recruited to the plaque structure of the zonula occludens. PMID: 18823282
Subcellular Location
Nucleus, nucleoplasm. Nucleus, PML body. Cell junction, tight junction. Note=Localized as a nuclear speckled-like pattern in proliferating primary fibroblasts. Colocalizes with HIRA, PML and SP100 in PML bodies of senescent cells. Colocalizes with TJP1 and CLDN1. Detected along the upper granular cell layer of epidermis. When overexpressed, accumulates in the nucleus in cells showing defective cytokinesis.
Protein Families
Ubinuclein family
Tissue Specificity
Ubiquitous. Also expressed in numerous tumors and cancer cell lines.