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: polyubiquitin binding; protein binding; single-stranded DNA binding
Biological Process: nucleotide-excision repair; nucleotide-excision repair, DNA damage recognition; nucleotide-excision repair, DNA duplex unwinding; nucleotide-excision repair, preincision complex assembly; protein deubiquitination; protein folding; regulation of proteasomal ubiquitin-dependent protein catabolic process