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"However, recent studies using the polyubiquitinated protein substrate Ub GST-Wbp2 (WW domain-binding protein 2, n > 30) to measure 26S proteasome-mediated protein degradation have revealed that gliotoxin and other ETPs inhibit proteasome activity in vitro and in cells by targeting the essential deubiquitinase Rpn11 [30,31] in the 19S regulatory complex of the 26S proteasome [111]."
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