RAD23B/HR23B Human Recombinant Protein

The protein encoded by this gene is one of two human homologs of Saccharomyces cerevisiae Rad23, a protein involved in the nucleotide excision repair (NER). This protein was found to be a component of the protein complex that specifically complements the NER defect of xeroderma pigmentosum group C (XP-c) cell extracts in vitro. This protein was also shown to interact with, and elevate the nucleotide excision activity of 3-methyladenine-DNA glycosylase (MPG), which suggested a role in DNA damage recognition in base excision repair. This protein contains an N-terminal ubiquitin-like domain, which was reported to interact with 26S proteasome, and thus this protein may be involved in the ubiquitin mediated proteolytic pathway in cells. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Sep 2011]

RAD23B: 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.

Protein type: Motility/polarity/chemotaxis

Chromosomal Location of Human Ortholog: 9q31.2

Cellular Component: nucleoplasm; proteasome complex; cytoplasm; nucleus

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