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Emerging biologic modalities for targeted protein degradation.

Alana G Caldwell1, Harshil Parmar2, Xiaoyu Zhang3

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|February 6, 2026
PubMed
Summary

Biologic degraders harness the ubiquitin-proteasome system for targeted protein degradation (TPD). This review explores diverse biologic TPD modalities, including E3 ligase-based systems and peptide strategies, for novel therapeutic applications.

Keywords:
E3 ubiquitin ligasesantibody and nanobody bindersbiologic degraderspeptide-based degraderstargeted protein degradationubiquitin–proteasome system

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Targeted protein degradation (TPD) utilizes the ubiquitin-proteasome system to eliminate disease-associated proteins.
  • Biologic degraders are protein chimeras that recruit cellular machinery to degrade specific protein targets.
  • They offer high specificity and modularity, addressing challenging targets for small molecules.

Purpose of the Study:

  • To survey the evolving landscape of biologic targeted protein degradation (TPD) modalities.
  • To highlight various biologic TPD systems and their components.
  • To discuss future directions and potential of biologic degraders.

Main Methods:

  • Review of existing literature on biologic TPD.
  • Categorization of TPD modalities based on recruited machinery (E3 ligases, E2 enzymes).
  • Analysis of different biologic ligand designs and emerging peptide-based strategies.

Main Results:

  • Biologic degraders represent a diverse class of molecules for TPD.
  • Key modalities include E3 ligase-based degraders, TRIM-Away, and TRIMbody-Away systems.
  • Peptide-based strategies are emerging as a bridge between biologic and synthetic approaches.

Conclusions:

  • Biologic degraders offer a powerful platform for TPD with potential for challenging targets.
  • Further development can enhance biologic degraders and expand their therapeutic scope.
  • The field of biologic TPD is rapidly expanding with diverse and innovative strategies.