USP1

This gene encodes a member of the ubiquitin-specific processing (UBP) family of proteases that is a deubiquitinating enzyme (DUB) with His and Cys domains. This protein is located in the cytoplasm and cleaves the ubiquitin moiety from ubiquitin-fused precursors and ubiquitinylated proteins. The protein specifically deubiquitinates a protein in the Fanconi anemia (FA) DNA repair pathway. Alternate transcriptional splice variants have been characterized. [provided by RefSeq, Jul 2008]

Ubiquitin Specific Peptidase 1

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.