Polyubiquitin-B

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** Polyubiquitin-B (229 aa, ~26 kDa) is encoded by the human UBB gene. This protein plays a role in both polyubiquitination and ubiquitin synthesis.

**Synonyms:** - Polyubiquitin B - UBB - Ubiquitin B - Ubiquitin-B