Cleavable and Cysteine-Selective Peptide Stapling Via Bifunctional Aryl Thioethers.

Area of Science:

• Medicinal Chemistry
• Drug Discovery
• Bioconjugation Chemistry

Background:

• Peptide stapling enhances peptide drug-likeness and stability compared to linear analogs.
• Developing efficient and selective peptide stapling techniques is crucial for drug discovery.
• Existing methods may have limitations in scope or cleavability.

Purpose of the Study:

• To develop a novel, cleavable, and cysteine-selective peptide stapling method.
• To create stapled peptides with improved drug-like properties.
• To demonstrate the utility of this approach in peptide drug development.

Main Methods:

• Aryl thioether derivatives were utilized for cysteine-selective peptide stapling.
• The method was tested for its tolerance to various reagents and peptide sequences.
• Characterization of stapled peptides included conformational analysis, stability assays, and cell permeability studies.
• Cleavage of the stapling moiety was achieved using exogenous thiols.

Main Results:

• The developed method efficiently produces stapled peptides.
• Stapled peptides maintained stable alpha-helical conformations.
• Significant improvements in chemical and enzymatic stability were observed.
• Enhanced cellular membrane permeability was demonstrated for the stapled peptides.
• The stapling moiety was successfully cleaved by thiols to release linear peptides.

Conclusions:

• A cleavable, cysteine-selective peptide stapling approach using aryl thioether derivatives is reported.
• This method yields stapled peptides with superior stability, permeability, and drug-like properties.
• The cleavable nature of the stapling moiety offers a versatile tool for peptide therapeutics development.