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Targeting Activin Receptor-like Kinase 2 Using Heterobifunctional Protein Degraders

Daniel T Webb1,2, Katherine L Jones2, Natsuko Macabuag2

  • 1Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, United Kingdom.

Journal of Medicinal Chemistry
|May 4, 2026
PubMed

Insights

Researchers developed novel ALK2 degraders, M4K3233 and M4K3250, to target bone morphogenetic protein signaling. These compounds show promise for treating fibrodysplasia ossificans progressiva and certain brain cancers.

Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Oncology

Background:

  • Activin receptor-like kinase 2 (ACVR1/ALK2) is crucial for bone morphogenetic protein (BMP) signaling pathways.
  • Dysregulation of ALK2 is implicated in fibrodysplasia ossificans progressiva (FOP), diffuse intrinsic pontine glioma (DIPG), and glioblastoma.

Purpose of the Study:

  • To develop novel chemical degraders targeting ALK2.
  • To investigate the therapeutic potential of ALK2 modulation in human diseases.

Main Methods:

  • Design and synthesis of first-in-class ALK2 degraders.
  • Utilizing M4K3233 as a chemical tool to elucidate ALK2 degradation mechanisms.
  • Optimization of lead compounds to enhance ALK2 degradation potency.

Main Results:

  • Successful development of M4K3233, a potent and selective ALK2 degrader.
  • Identification of M4K3250, a derivative with improved ALK2 degradation efficacy.
  • Demonstration of the utility of these compounds in studying ALK2's role in disease.

Conclusions:

  • The developed ALK2 degraders, including M4K3250, represent a promising new class of therapeutic agents.
  • These compounds offer valuable tools for understanding ALK2-related pathologies.
  • The findings support the translational potential of ALK2 degraders in drug discovery for FOP, DIPG, and glioblastoma.

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