Targeting SUMOylation dependency in human cancer stem cells through a unique SAE2 motif revealed by chemical genomics

Cell Chem Biol. 2021 Oct 21;28(10):1394-1406.e10. doi: 10.1016/j.chembiol.2021.04.014. Epub 2021 May 11.

Abstract

Natural products (NPs) encompass a rich source of bioactive chemical entities. Here, we used human cancer stem cells (CSCs) in a chemical genomics campaign with NP chemical space to interrogate extracts from diverse strains of actinomycete for anti-cancer properties. We identified a compound (McM25044) capable of selectively inhibiting human CSC function versus normal stem cell counterparts. Biochemical and molecular studies revealed that McM025044 exerts inhibition on human CSCs through the small ubiquitin-like modifier (SUMO) cascade, found to be hyperactive in a variety of human cancers. McM025044 impedes the SUMOylation pathway via direct targeting of the SAE1/2 complex. Treatment of patient-derived CSCs resulted in reduced levels of SUMOylated proteins and suppression of progenitor and stem cell capacity measured in vitro and in vivo. Our study overcomes a barrier in chemically inhibiting oncogenic SUMOylation activity and uncovers a unique role for SAE2 in the biology of human cancers.

Keywords: SUMOylation; drug; leukemia; natural products; screening; selectivity; stem cells.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antineoplastic Agents / chemistry
  • Antineoplastic Agents / metabolism
  • Antineoplastic Agents / pharmacology
  • Antineoplastic Agents / therapeutic use
  • Binding Sites
  • Biological Products / chemistry
  • Biological Products / metabolism
  • Biological Products / pharmacology
  • Biological Products / therapeutic use
  • Cell Line, Tumor
  • Cell Self Renewal
  • Cell Survival / drug effects
  • Humans
  • Leukemia, Myeloid, Acute / drug therapy
  • Leukemia, Myeloid, Acute / pathology
  • Mice
  • Molecular Docking Simulation
  • Neoplastic Stem Cells / cytology
  • Neoplastic Stem Cells / metabolism*
  • RNA Interference
  • RNA, Small Interfering / metabolism
  • Sumoylation / drug effects
  • Ubiquitin-Activating Enzymes / chemistry
  • Ubiquitin-Activating Enzymes / genetics
  • Ubiquitin-Activating Enzymes / metabolism*

Substances

  • Antineoplastic Agents
  • Biological Products
  • RNA, Small Interfering
  • UBA2 protein, human
  • Ubiquitin-Activating Enzymes