As its name suggests, DDB1 was initially implicated in the process of a specific type of DNA repair known as
nucleotide excision repair. Since then, researchers have found that DDB1 primarily functions as a core component of the
CUL4A- and
CUL4B-based E3
ubiquitin ligase complexes. DDB1 serves as a bridge or adaptor protein which interacts with dozens of proteins known as DDB1 and CUL4-associated factors (DCAFs). These DCAFs are often ubiquitin ligase
substrates and regulate numerous essential processes in the cell including DNA repair (DDB2), DNA replication, chromatin remodeling (
Cdt2) and more. == Interactions ==