UV excision repair protein RAD23 homolog B (RAD23B)

Multiubiquitin chain receptor involved in modulation of proteasomal degradation. Binds to polyubiquitin chains.

Proposed to be able 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.