UV excision repair protein RAD23 homolog A (RAD23A)

Multiubiquitin chain receptor involved in modulation of proteasomal degradation. Binds to'Lys-48'-linked polyubiquitin chains in a length-dependent fashion and with a lower affinity to'Lys-63'-linked 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. .