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Development of PolyHis-Targeting PROTAC Degraders.

Hui Chen1, Dong Zhu2,3, Monica Billitti2,3

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Summary
This summary is machine-generated.

Researchers developed polyhistidine-targeting PROTACs (polyHisTACs) to degrade proteins of interest (POIs) lacking specific ligands. This novel approach leverages a simple polyhistidine tag for targeted protein degradation via the ubiquitin-proteasome system (UPS).

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HiBiTPROTACpolyhistidinetargeted protein degradation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Targeted protein degradation (TPD) utilizes proteolysis targeting chimeras (PROTACs) to eliminate proteins of interest (POIs) through the ubiquitin-proteasome system (UPS).
  • A major limitation for PROTAC application is the scarcity of high-quality target ligands for many proteins, hindering the assessment of their degradability.
  • Existing tag-based systems for protein degradation have limitations that restrict their broad applicability.

Purpose of the Study:

  • To develop a versatile platform for targeted protein degradation independent of specific target ligands.
  • To overcome the limitations of current tag-based degrader systems.
  • To enable the assessment of protein degradability for previously undruggable targets.

Main Methods:

  • Development of polyhistidine-targeting PROTACs (polyHisTACs) by linking a Ni2+-NTA headgroup to VHL or CRBN E3 ligase ligands.
  • Recruitment of E3 ligase complexes to polyhistidine-tagged proteins of interest (POIs).
  • Degradation assays using CRISPR-engineered, endogenously polyHis-tagged BRD4 and exogenously expressed, polyHis-tagged PSPC1.

Main Results:

  • PolyHisTACs successfully degraded CRISPR-engineered, endogenously polyHis-tagged BRD4.
  • Robust degradation of an exogenously expressed, polyHis-tagged RNA-binding protein, PSPC1, was achieved.
  • The polyHisTAC system demonstrated effectiveness even for a typically undruggable target.

Conclusions:

  • PolyHisTACs provide a versatile and reliable method for evaluating UPS-mediated degradability without requiring target-specific ligands.
  • This platform facilitates acute protein of interest (POI) depletion in basic research settings.
  • The minimal and easily implemented polyhistidine tag overcomes key limitations of existing tag-based degrader systems.