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An engineered ubiquitin binding coiled coil peptide.

Pernille Vosbein1, Paula Paredes Vergara2, Danny T Huang2,3

  • 1School of Chemistry, University of Glasgow Glasgow G12 8QQ UK Drew.Thomson@glasgow.ac.uk.

Chemical Science
|September 13, 2024
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Summary
This summary is machine-generated.

Researchers designed a stable coiled-coil peptide scaffold presenting ubiquitin-interacting motif (UIM) residues. This novel CC-UIM peptide shows enhanced binding to ubiquitin (Ub) compared to UIM alone, offering a new strategy for protein binder design.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Structural Biology

Background:

  • Ubiquitin (Ub) recognition is crucial in cellular processes.
  • Ubiquitin-binding domains, like the Ubiquitin Interacting Motif (UIM), often mediate low-affinity interactions.
  • Designing high-affinity Ub binders is a significant challenge.

Purpose of the Study:

  • To design a novel peptide scaffold for enhanced ubiquitin binding.
  • To create a stable, crosslinked coiled-coil (CC) peptide presenting UIM binding residues.
  • To investigate the binding affinity and structural basis of the designed peptide-ubiquitin interaction.

Main Methods:

  • Design and synthesis of a crosslinked coiled-coil peptide (CC-UIM) incorporating UIM sequences.
  • Fluorescence polarization assays to quantify binding affinity to ubiquitin.
  • X-ray crystallography to determine the structure of the CC-UIM peptide in complex with ubiquitin.

Main Results:

  • The crosslinked CC-UIM peptide demonstrated significantly enhanced binding affinity to ubiquitin compared to the original UIM sequence.
  • The crystal structure revealed the preorganization of key binding residues on the stable helical scaffold.
  • The CC-UIM peptide successfully reconciled features of both UIM and CC sequences.

Conclusions:

  • Preorganizing key binding residues onto a stable helical scaffold is an effective strategy for designing high-affinity protein binders.
  • The CC-UIM peptide represents a promising tool for studying ubiquitin interactions.
  • This approach advances the field of protein-protein interaction modulation and drug design.