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Proteolysis-targeting chimeras with reduced off-targets.

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Summary
This summary is machine-generated.

Proteolysis-targeting chimeras (PROTACs) using pomalidomide can degrade unintended zinc-finger proteins. Modifying pomalidomide

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Proteolysis-targeting chimeras (PROTACs) harness E3 ligases for targeted protein degradation.
  • Pomalidomide, a common E3 ligase recruiter in PROTACs, exhibits off-target degradation of zinc-finger (ZF) proteins.
  • This off-target effect limits the therapeutic potential of pomalidomide-based PROTACs.

Purpose of the Study:

  • To investigate and mitigate off-target zinc-finger protein degradation induced by pomalidomide-based PROTACs.
  • To establish PROTAC design principles that minimize unintended protein degradation.
  • To develop improved PROTACs with enhanced efficacy and specificity.

Main Methods:

  • Development of a high-throughput platform for interrogating off-target degradation.
  • Synthesis and screening of a library of pomalidomide analogues with modifications on the phthalimide ring.
  • Assessment of hydrogen bonding, steric, and hydrophobic effects on ZF protein degradation.
  • Validation using target engagement assays and proteomics.
  • Design and testing of anaplastic lymphoma kinase (ALK) oncoprotein-targeting PROTACs.

Main Results:

  • Existing pomalidomide-based PROTACs were confirmed to degrade multiple ZF proteins.
  • Modifications at the C5 position of the phthalimide ring effectively reduced off-target ZF protein degradation.
  • Structure-activity relationship studies elucidated key factors influencing off-target effects.
  • Novel ALK-targeting PROTACs demonstrated increased potency and significantly reduced off-target degradation.

Conclusions:

  • Strategic modification of pomalidomide analogues can minimize off-target ZF protein degradation.
  • These findings provide crucial design rules for developing safer and more effective PROTACs.
  • The developed PROTACs represent a promising advancement for targeted cancer therapy, exemplified by ALK inhibition.