Organic Nanoscrolls from Electrostatic Interactions between Peptides and Lipids: Assembly Steps and Structure

Area of Science:

• Biophysics
• Materials Science
• Cell Biology

Background:

• Cell shape flexibility is crucial for motion and environmental adaptation.
• Protein-membrane interactions, particularly electrostatic forces, mediate this versatility.
• Lanreotide, a dicationic peptide, self-assembles into uniform nanotubes.

Purpose of the Study:

• To investigate the interaction between the cationic peptide lanreotide and lipid model membranes.
• To characterize the self-assembly process and resulting structures.
• To elucidate the role of electrostatics in peptide-lipid packing.

Main Methods:

• Utilized lipid model membranes with negative charges.
• Examined the self-assembly of lanreotide in the presence of these membranes.
• Deciphered the formation steps and molecular structure of the self-assembled structures.

Main Results:

• The interaction induced the formation of myelin sheath-like structures termed nanoscrolls.
• Electrostatic forces were shown to significantly modify the spontaneous packing of peptides and lipids.
• Detailed steps and molecular insights into nanoscroll formation were obtained.

Conclusions:

• Electrostatic interactions are key drivers in the formation of peptide-induced membrane structures.
• Lanreotide's self-assembly properties, combined with membrane charge, lead to unique nanoscroll architectures.
• This work provides a molecular understanding of how electrostatics govern peptide-lipid self-assembly and membrane morphology.