Mechanism of interactions between tripeptide NCW on cellular membrane using molecular dynamic simulation

Area of Science:

• Biophysics
• Pharmacology
• Computational Chemistry

Background:

• Tripeptide NCW exhibits antihypertensive effects.
• NCW's membrane absorption mechanism is poorly understood, limiting its therapeutic application.

Purpose of the Study:

• Investigate the interaction mechanism between NCW and dipalmitoylphosphatidylcholine (DPPC) membranes.
• Analyze NCW's dynamic behavior and structural changes during membrane absorption.
• Elucidate the role of specific residues and interactions in NCW membrane penetration.

Main Methods:

• Conducted a 400 ns all-atom molecular dynamics simulation using GROMACS.
• Analyzed NCW's structural variations, location, and distribution within the DPPC membrane.
• Examined the impact of NCW on membrane properties.

Main Results:

• NCW structures remained stable throughout the simulation.
• NCW was observed to bind to the DPPC membrane surface and penetrate its hydrophobic core.
• The residue Tyrosine (Tyr) was identified as crucial for NCW membrane absorption.
• Hydrogen bonds and hydrophobic interactions were key in stabilizing NCW-membrane binding.

Conclusions:

• NCW can effectively interact with and permeate DPPC membranes.
• The study provides atomic-level insights into NCW-membrane interactions, crucial for future transmembrane transport studies.
• Findings lay the groundwork for developing NCW-based therapies with improved bioavailability.