Eeyarestatin I is an inhibitor of the ERAD (Endoplasmic-reticulum -associated protein degradation) pathway, blocking the degradation of misfolded proteins at a dose of 8 μM. It associates with the p97-associated deubiquitinating complex in cells, preventing deubiquitination of substrates by ataxin-3 (atx3). Also inhibits Sec61-mediated protein translocation at the ER. Displays cytotoxic activity preferentially against cancer cells; induces cell death via the pro-apoptotic protein NOXA. MW: 630.44. Purity ≥98% by HPLC