Multiubiquitin chain receptor involved in modulation of proteasomal degradation. Binds to polyubiquitin chains. Proposed to be capable to bind simultaneously to the 26S proteasome and to polyubiquitinated substrates and to deliver ubiquitinated proteins to the proteasome. May play a role in endoplasmic reticulum- associated degradation (ERAD) of misfolded glycoproteins by association with PNGase and delivering deglycosylated proteins to the proteasome. Belongs to the RAD23 family. Note: This description may include information from UniProtKB.
Molecular Function: protein binding; damaged DNA binding; polyubiquitin binding; single-stranded DNA binding
Biological Process: nucleotide-excision repair, DNA damage recognition; proteasomal ubiquitin-dependent protein catabolic process; nucleotide-excision repair; regulation of proteasomal ubiquitin-dependent protein catabolic process; spermatogenesis; nucleotide-excision repair, DNA damage removal; DNA repair
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.