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Updated: Apr 27, 2026

Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
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Identification of novel covalent ligands that disrupt Acetyl-Lysine binding to the SETDB1 tudor domain

Jun Ma1, Yunyuan Huang1, Tao Zheng2

  • 1Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, 430079, China.

Biochemical and Biophysical Research Communications
|April 25, 2026
PubMed

Insights

Researchers identified new covalent ligands, XY047 and XY087, targeting the SETDB1 Tudor domain's Kac pocket. These compounds are valuable tools for studying SETDB1's role in diseases like cancer and neurodegeneration.

Area of Science:

  • Biochemistry
  • Epigenetics
  • Chemical Biology

Background:

  • SETDB1 is a histone methylation reader implicated in cancer and neurodegenerative diseases.
  • Its Tudor domain recognizes H3K9me2/K14ac marks through Kme and Kac pockets.
  • Targeting the SETDB1 Kac pocket presents a therapeutic opportunity, but ligands are underexplored.

Purpose of the Study:

  • To identify novel covalent ligands targeting the SETDB1 Tudor domain's Kac pocket.
  • To develop chemical tools for investigating SETDB1's biological functions in disease.

Main Methods:

  • Differential scanning fluorimetry (DSF) screening.
  • Iodoacetamide-rhodamine (IA-rhodamine, IAR) assay.
  • Cell lysate-based binding assays.

Main Results:

  • Two covalent ligands, XY047 and XY087, were identified.
  • These ligands primarily target Cys329 and bind to the SETDB1 Tudor domain's Kac pocket.
  • Binding activity was confirmed in cell lysates.

Conclusions:

  • XY047 and XY087 are effective covalent inhibitors of the SETDB1 Tudor domain.
  • These ligands serve as valuable chemical probes for SETDB1 research.
  • The findings advance the development of SETDB1-targeted therapeutics for cancer and neurodegeneration.
Keywords:
Covalent ligandSETDB1Tudor domain

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