UBP1

Functions as a transcriptional activator in a promoter context-dependent manner. Modulates the placental expression of CYP11A1. Involved in regulation of the alpha-globin gene in erythroid cells. Activation of the alpha-globin promoter in erythroid cells is via synergistic interaction with TFCP2 (By similarity). Involved in regulation of the alpha-globin gene in erythroid cells. Binds strongly to sequences around the HIV-1 initiation site and weakly over the TATA-box. Represses HIV-1 transcription by inhibiting the binding of TFIID to the TATA-box.

upstream binding protein 1 (LBP-1a)

Negative regulator of DNA damage repair which specifically deubiquitinates monoubiquitinated FANCD2 (PubMed:15694335).
Also involved in PCNA-mediated translesion synthesis (TLS) by deubiquitinating monoubiquitinated PCNA (PubMed:16531995, PubMed:20147293).
Has almost no deubiquitinating activity by itself and requires the interaction with WDR48 to have a high activity (PubMed:18082604, PubMed:26388029).

Biological Process DNA repair Source:UniProtKB-KW
Biological Process monoubiquitinated protein deubiquitination Source:UniProtKB1 Publication
Biological Process positive regulation of error-prone translesion synthesis Source:Reactome
Biological Process protein deubiquitination Source:UniProtKB1 Publication
Biological Process regulation of DNA repair Source:UniProtKB1 Publication
Biological Process response to UV Source:UniProtKB1 Publication
Biological Process skeletal system development Source:Ensembl
Biological Process ubiquitin-dependent protein catabolic process Source:InterPro

Nucleus

Autocatalytic cleavage of USP1 following UV irradiation inactivates it, leading to an increase in ubiquitinated PCNA, recruitment of POLH and translesion synthesis.
Ubiquitin carboxyl-terminal hydrolase 1, N-terminal fragment
Ubiquitinated by the CRL2(KLHDC2) complex following autocatalytic cleavage, leading to its degradation: the CRL2(KLHDC2) complex recognizes the diglycine (Gly-Gly) at the C-terminus.