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Phenotypic Screening for Targeted Protein Degradation: Strategies, Challenges, and Emerging Opportunities.

Baoli Ding1, Jiawen Hu1, Binyan Shou1

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Phenotypic protein degrader discovery (PPDD) offers a biology-first approach to identify novel degraders by observing cellular responses. This method complements target-based strategies and expands the range of treatable proteins.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Targeted protein degradation is a key therapeutic strategy.
  • Traditional target-based approaches require detailed structural and binding data.
  • Phenotypic screening offers an alternative by focusing on cellular outcomes.

Purpose of the Study:

  • To examine the components of phenotypic protein degrader discovery (PPDD) workflows.
  • To highlight the advantages and challenges of PPDD.
  • To discuss the impact of emerging technologies on PPDD.

Main Methods:

  • Review of PPDD workflows including assay selection, library construction, and deconvolution.
  • Analysis of challenges in discerning phenotypes and elucidating mechanisms.
  • Examination of emerging technologies like CRISPR screens, multiomics, automation, and machine learning.

Main Results:

  • Phenotypic screening identifies active degraders based on cellular responses, bypassing structural requirements.
  • PPDD provides novel biological and chemical starting points for drug discovery.
  • Emerging technologies are enhancing the efficiency and scope of PPDD.

Conclusions:

  • Phenotypic screening is a powerful complement to target-based drug discovery.
  • PPDD facilitates the discovery of degraders for previously intractable targets.
  • The integration of advanced technologies is crucial for the future of PPDD.