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Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes
Published on: February 19, 2016
Potential functional changes in native lysozyme induced by carbon nanotubes studied by molecular dynamics simulations
S Mehdi Vaez Allaei1,2,3, Mehriar Amininasab4, Hrachya Ishkhanyan5
1Department of Physics, University of Tehran, Tehran, 14395-547, Iran. smvaez@ut.ac.ir.
Carbon nanotubes (CNTs) interact with proteins like lysozyme. Docking simulations reveal that while native lysozyme changes conformation after docking, denatured lysozyme binds more strongly to CNTs.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Computational Biology
Background:
- Carbon nanotubes (CNTs) can influence biological systems, affecting protein functionality and potentially causing toxicity.
- Understanding protein-CNT interactions is crucial for assessing nanoparticle safety and applications.
Purpose of the Study:
- To investigate the adsorption and interaction of lysozyme with CNTs using molecular dynamics simulations.
- To explore how docking influences protein-CNT complex formation and conformational changes.
Main Methods:
- Long-scale (1-2 µs) molecular dynamics simulations.
- Examination of four systems: native lysozyme/CNT and denatured lysozyme/CNT, both pre- and post-docking.
- Analysis of conformational changes and binding interactions.
Main Results:
- Native lysozyme shows no conformational change upon initial CNT capture but does change after docking.
- Denatured lysozyme exhibits stronger binding to CNTs in both pre- and post-docking states.
- Key residues (arginine, tryptophan) and interactions (π-π stacking, van der Waals) drive lysozyme adsorption onto CNTs.
Conclusions:
- Docking significantly impacts simulated protein-nanoparticle interactions, potentially altering conclusions about nanoparticle toxicity and function.
- The binding mechanism involves multimodal interactions, primarily π-π stacking and van der Waals forces.
- Lysozyme's conformational response to CNTs depends on its native or denatured state and the simulation's docking stage.
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