Ub4ix

Ub4ix is a DUB/26S proteasome inhibitor. Ub4ix can protect K48-linked Ub chains from being chopped up by deubiquitinating enzymes (DUBs) and prevent the proteasomal degradation of Ub-tagged proteins. Ub4ix can reduce the viability of Hela cells and induce apoptosis, with an IC50 value of 1.6 μM[1][2].

[1] Nawatha M, et al. De novo macrocyclic peptides that specifically modulate Lys48-linked ubiquitin chains. Nat Chem. 2019 Jul;11(7):644-652. DOI:10.1038/s41557-019-0278-x
[2] Saha A, et al. Combining Chemical Protein Synthesis and Random Nonstandard Peptides Integrated Discovery for Modulating Biological Processes. Acc Chem Res. 2023 Jul 18;56(14):1953-1965. DOI:10.1021/acs.accounts.3c00178