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USP1 deubiquitinates BCAT2. 4 / 4
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"Next, we found that treatment with ML323, a specific inhibitor of USP1 [33], enhanced BCAT2 ubiquitylation (Fig. 2B) whereas USP1 wild-type but not enzyme-dead C90S mutant overexpression decreased BCAT2 ubiquitylation (Fig. 2C)."

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"Furthermore, USP1 knockdown enhanced ubiquitylation of the BCAT2 but not BCAT2 mutant (Fig. 3B)."

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"In contrast, ectopic USP1 expression decreased ubiquitylation of the BCAT2 but not BCAT2 mutant (Fig. 3C)."

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"BCAAs promote the expression of USP1 protein, and USP1 can deubiquitylate BCAT2."