Disulfiram and 6-Thioguanine synergistically inhibit the enzymatic activities of USP2 and USP21

Hsin Cheng Lin, Ying Kuan, Hsu Feng Chu, Shu Chun Cheng, Heng Chih Pan, Wei Yi Chen, Chiao Yin Sun*, Ta Hsien Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Disulfiram is a promising repurposed drug that, combining with radiation and chemotherapy, exhibits effective anticancer activities in several preclinical models. The cellular metabolites of disulfiram have been established, however, the intracellular targets of disulfiram remain largely unexplored. We have previously reported that disulfiram suppresses the coronaviral papain-like proteases through attacking their zinc-finger domains, suggesting an inhibitory function potentially on other proteases with similar catalytic structures. Ubiquitin-specific proteases (USPs) share a highly-conserved zinc-finger subdomain that structurally similar to the papain-like proteases and are attractive anticancer targets as upregulated USPs levels are found in a variety of tumors. Here, we report that disulfiram functions as a competitive inhibitor for both USP2 and USP21, two tumor-related deubiquitinases. In addition, we also observed a synergistic inhibition of USP2 and USP21 by disulfiram and 6-Thioguanine (6TG), a clinical drug for acute myeloid leukemia. Kinetic analyses revealed that both drugs exhibited a slow-binding mechanism, moderate inhibitory parameters, and a synergistically inhibitory effect on USP2 and USP21, suggesting the potential combinatory use of these two drugs for USPs-related tumors. Taken together, our study provides biochemical evidence for repurposing disulfiram and 6TG as a combinatory treatment in clinical applications.

Original languageEnglish
Pages (from-to)490-497
Number of pages8
JournalInternational Journal of Biological Macromolecules
Volume176
DOIs
StatePublished - 15 Apr 2021

Keywords

  • 6-Thioguanine
  • Disulfiram
  • DUB
  • USP
  • USP2
  • USP21

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