ZBTB1
Domain
Both the BTB domain and C2H2-type motifs are necessary for transcriptional repression activity. The BTB domain is also necessary for oligomerization and efficient sumoylation. The hydrophobic cluster preceding Lys-328 enhanced sumoylation efficiency (PubMed:20797634).
The UBZ-type zinc finger domain is required for targeting ZBTB1 to UV damage sites and for PCNA monoubiquitination. UBZ-type zinc finger domain mediates binding to 'Lys-63'-linked polyubiquitin chains (in vitro).
Function
Acts as a transcriptional repressor (PubMed:20797634). Represses cAMP-responsive element (CRE)-mediated transcriptional activation (PubMed:21706167). In addition, has a role in translesion DNA synthesis. Requires for UV-inducible RAD18 loading, PCNA monoubiquitination, POLH recruitment to replication factories and efficient translesion DNA synthesis (PubMed:24657165). Plays a key role in the transcriptional regulation of T lymphocyte development (By similarity).
Post-translational modifications
Sumoylated with SUMO2 at Lys-328 and to a lesser extent at Lys-265. Sumoylation inhibits its transcriptional repression activity and regulates its subcellular localization.
Cellular localization
- Nucleus
- Nucleus
- Nucleoplasm
- Localized in dot-like structures in the nucleus (PubMed:21706167). Colocalized with SMRT in nuclear bodies (PubMed:20797634). The sumoylated form is preferentially located in the nucleoplasm outside the nuclear bodies (PubMed:20797634).
Alternative names
KIAA0997, ZBTB1, Zinc finger and BTB domain-containing protein 1