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Researchers developed sugar-coated proteolysis targeting chimeras (SCPs) that require enzymatic removal of a sugar moiety for targeted protein degradation. This metabolic gating strategy enhances selectivity for PROTACs by controlling their activity via O-GlcNAc modification and O-GlcNAcase (OGA) enzymes.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Targeted protein degradation utilizes proteolysis targeting chimeras (PROTACs) to direct proteins to the ubiquitin-proteasome system.
  • Commonly used E3 ligases like cereblon (CRBN) are broadly expressed, limiting PROTAC selectivity.
  • Developing strategies for metabolic gating of PROTAC activity is crucial for enhancing therapeutic specificity.

Purpose of the Study:

  • To develop a novel enzymatic activation strategy for PROTACs using O-GlcNAc modification.
  • To create sugar-coated PROTACs (SCPs) that are activated by enzymatic removal of the O-GlcNAc moiety.
  • To investigate the impact of O-GlcNAc modification on CRBN binding and target protein degradation.

Main Methods:

  • Structural analyses of cyclimid degraders complexed with CRBN and BRD4.
  • Synthesis of O-GlcNAc-modified cyclimids (SCPs).
  • In vitro biochemical binding assays, cellular degradation assays, and cell viability assays.

Main Results:

  • Glycosylation of cyclimids reduced CRBN binding and complex formation with BRD4.
  • Enzymatic removal of the O-GlcNAc moiety by O-GlcNAcase (OGA) restored CRBN binding and induced target protein degradation.
  • Demonstrated requirement for enzymatic activation in engineered and native cell lines.

Conclusions:

  • O-GlcNAc modification serves as an effective mechanism for metabolically gating targeted protein degradation.
  • Enzymatic activation strategies can enhance the selectivity of PROTACs.
  • This approach motivates the development of similar strategies using other protein modifications for improved selectivity.