The 20S as a stand-alone proteasome in cells can degrade the ubiquitin tag.
Sahu I, Mali SM, Sulkshane P, Xu C, Rozenberg A, Morag R, Sahoo MP, Singh SK, Ding Z, Wang Y, Day S, Cong Y, Kleifeld O, Brik A, Glickman MH
Nat Commun. 2021 Oct 26;12(1):6173. doi: 10.1038/s41467-021-26427-0.
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