The ubiquitin-proteasome pathway is the pathway in which molecules, specifically proteins, are broken down into smaller molecules in the cytosol or in the nucleus.This pathway subsequently has effects in many other pathways and processes. This pathway uses 2 distinct steps. The first step is that the protein being broken down is tagged by multiple ubiquitin units attaching to the protein. The second step is that the protein that has been tagged degrades as it is catalyzed by the 26S proteasome. This pathway is important for DNA repair, regulating the amount of proteins, and the creation of antigen-peptide.

Ubiquitin–Proteasome Pathway References