Novel structures of self-associating stapled peptides

Area of Science:

• Biochemistry
• Structural Biology
• Drug Discovery

Background:

• Hydrocarbon stapling transforms linear peptides into cell-permeable helical structures targeting biological molecules.
• Stapled peptides show promise as inhibitors of HIV-1 capsid assembly.

Purpose of the Study:

• To characterize hydrocarbon stapled peptides with HIV-1 inhibitory activity.
• To evaluate factors modulating activity, including staple length, position, and charge.
• To investigate peptide self-association into polymeric structures.

Main Methods:

• High-resolution solution Nuclear Magnetic Resonance (NMR) spectroscopy.
• Dynamic Light Scattering (DLS).
• Characterization of peptide structure, stability, and self-association.

Main Results:

• Peptides exhibit self-association into organized polymeric structures, driven by hydrophobic interactions.
• Staple length, position, and olefinic bond isomerization influence helical conformation and polymerization propensity.
• Activity is modulated by variations in charge, staple length, and position.

Conclusions:

• Peptide self-association is a critical factor in the design of biologically active stapled peptides.
• Understanding these structural and self-associative properties is crucial for optimizing stapled peptides in drug discovery.
• This research highlights challenges and provides insights for developing novel therapeutic agents.