Molecular Dynamics Simulations Show That Short Peptides Can Drive Synthetic Cell Division by Binding to the Inner...

Area of Science:

• Biophysics
• Synthetic Biology
• Computational Chemistry

Background:

• Cell division is a fundamental process in living organisms.
• Synthetic cells aim to replicate life-like functions, including division.
• Current methods for synthetic cell division often rely on proteins found in natural cells.

Purpose of the Study:

• To explore the potential of short membrane-anchored peptides for inducing synthetic cell division.
• To investigate the biophysical mechanisms by which peptides interact with lipid bilayers.
• To determine if peptides can drive membrane fission independently of natural cellular machinery.

Main Methods:

• Coarse-grained molecular dynamics simulations using the MARTINI model.
• Investigated the interaction between short membrane-anchored peptides and lipid bilayer patches.
• Systematically varied the electrostatic charge of the peptides.

Main Results:

• Peptides induced significant spontaneous curvature in lipid bilayers.
• The peptide-lipid complex behaved like a conically shaped lipid with a bulky headgroup.
• Increasing peptide charge enhanced constriction forces, even at dilute surface coverage.
• Oppositely charged peptides induced division by binding to the inner membrane leaflet.

Conclusions:

• Short membrane-anchored peptides show promise for inducing synthetic cell division.
• Peptide-induced membrane curvature and constriction forces are key mechanisms.
• Electrostatic interactions play a crucial role in peptide-mediated cell division.
• This offers a novel, non-protein-based approach to synthetic cell division.