Epidithiodiketopiperazines Inhibit Protein Degradation by Targeting Proteasome Deubiquitinase Rpn11

Cell Chemical Biology
Jing LiRaymond J Deshaies

Abstract

The 26S proteasome is the major proteolytic machine for breaking down cytosolic and nuclear proteins in eukaryotes. Due to the lack of a suitable assay, it is difficult to measure routinely and quantitatively the breakdown of proteins by the 26S proteasome in vitro. In the present study, we developed an assay to monitor proteasome-mediated protein degradation. Using this assay, we discovered that epidithiodiketopiperazine (ETPs) blocked the degradation of our model substrate in vitro. Further characterization revealed that ETPs inhibited proteasome function by targeting the essential proteasomal deubiquitinase Rpn11 (POH1/PSMD14). ETPs also inhibited other JAMM (JAB1/MPN/Mov34 metalloenzyme) proteases such as Csn5 and AMSH. An improved ETP with fewer non-specific effects, SOP11, stabilized a subset of proteasome substrates in cells, induced the unfolded protein response, and led to cell death. SOP11 represents a class of Rpn11 inhibitor and provides an alternative route to develop proteasome inhibitors.

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Citations

Feb 9, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·David J Sherman, Jing Li
Mar 21, 2020·Biochemical Society Transactions·Hai Qiu WuHuib Ovaa
Feb 15, 2020·New Zealand Veterinary Journal·T W Jordan
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Nov 20, 2020·The FEBS Journal·Xiang ChenKylie J Walters
Jul 3, 2021·International Journal of Molecular Sciences·Seonghyeon MoonByung-Hoon Lee
Aug 18, 2021·Journal of Chemical Information and Modeling·Aayush Gupta, Huan-Xiang Zhou
Nov 5, 2019·Journal of Medicinal Chemistry·Nathan J SchauerSara J Buhrlage
Aug 30, 2021·Biomarker Research·Hu LeiYingli Wu

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