2. Academic Validation
  3. Small-molecule inhibitors targeting Polycomb repressive complex 1 RING domain

Small-molecule inhibitors targeting Polycomb repressive complex 1 RING domain

  • Nat Chem Biol. 2021 Jul;17(7):784-793. doi: 10.1038/s41589-021-00815-5.
Shirish Shukla  # 1,  Weijiang Ying  # 1,  Felicia Gray  # 1,  Yiwu Yao  # 1,  Miranda L Simes  # 1,  Qingjie Zhao 1,  Hongzhi Miao 1,  Hyo Je Cho 1,  Paula González-Alonso 1,  Alyssa Winkler 1,  George Lund 1,  Trupta Purohit 1,  EunGi Kim 1,  Xiaotian Zhang 1,  Joshua M Ray 1,  Shihan He 1,  Caroline Nikolaidis 1,  Juliano Ndoj 1,  Jingya Wang 1 2,  Łukasz Jaremko 3,  Mariusz Jaremko 3,  Russell J H Ryan 1,  Monica L Guzman 4,  Jolanta Grembecka 5,  Tomasz Cierpicki 6
Affiliations

Affiliations

  • 1 Department of Pathology, University of Michigan, Ann Arbor, MI, USA.
  • 2 MedImmune, LLC, Gaithersburg, MD, USA.
  • 3 Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia.
  • 4 Division of Hematology and Medical Oncology, Leukemia Program, Weill Cornell Medicine/New York-Presbyterian Hospital, New York, NY, USA.
  • 5 Department of Pathology, University of Michigan, Ann Arbor, MI, USA. jolantag@umich.edu.
  • 6 Department of Pathology, University of Michigan, Ann Arbor, MI, USA. tomaszc@umich.edu.
  • # Contributed equally.
PMID: 34155404 DOI: 10.1038/s41589-021-00815-5
Abstract

Polycomb repressive complex 1 (PRC1) is an essential chromatin-modifying complex that monoubiquitinates histone H2A and is involved in maintaining the repressed chromatin state. Emerging evidence suggests PRC1 activity in various cancers, rationalizing the need for small-molecule inhibitors with well-defined mechanisms of action. Here, we describe the development of compounds that directly bind to RING1B-BMI1, the heterodimeric complex constituting the E3 Ligase activity of PRC1. These compounds block the association of RING1B-BMI1 with chromatin and inhibit H2A ubiquitination. Structural studies demonstrate that these inhibitors bind to RING1B by inducing the formation of a hydrophobic pocket in the RING domain. Our PRC1 inhibitor, RB-3, decreases the global level of H2A ubiquitination and induces differentiation in leukemia cell lines and primary acute myeloid leukemia (AML) samples. In summary, we demonstrate that targeting the PRC1 RING domain with small molecules is feasible, and RB-3 represents a valuable chemical tool to study PRC1 biology.

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