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Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments
Published on: January 7, 2019
Adsorption behavior of hydrophobin proteins on polydimethylsiloxane substrates
Yingzhe Liu1, Ming Wu, Xizeng Feng
1College of Chemistry, Nankai University, Tianjin, 300071, People's Republic of China.
The Journal of Physical Chemistry. B
|September 21, 2012
Summary
Protein adsorption on polydimethylsiloxane (PDMS) surfaces was simulated. The hydrophobic protein HFBI preferentially binds via its hydrophobic patch, exposing hydrophilic regions to water and enhancing surface hydrophilicity for protein immobilization.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Computational Biophysics
Background:
- Designing bioactive surfaces for protein immobilization is crucial.
- Hydrophobic protein HFBI adsorption on polydimethylsiloxane (PDMS) can alter surface properties.
- Understanding protein-surface interactions is key for biomaterial development.
Purpose of the Study:
- To elucidate the adsorption mechanism of HFBI on PDMS using atomistic molecular dynamics simulations.
- To determine the preferred adsorption modes and driving forces of HFBI on hydrophobic surfaces.
- To investigate the impact of HFBI adsorption on the surface wettability of PDMS.
Main Methods:
- Atomistic molecular dynamics simulations were performed.
- Nine independent simulations with varying initial protein orientations were conducted.
- Relative binding free energies were calculated to identify the most stable adsorption modes.
Main Results:
- HFBI adsorption preserves its secondary structures due to disulfide bonds.
- The most energetically favorable adsorption mode involves HFBI's hydrophobic patch binding to PDMS.
- This favorable mode exposes HFBI's hydrophilic regions, increasing surface hydrophilicity.
Conclusions:
- HFBI adsorption on PDMS is driven by hydrophobic interactions.
- The modified PDMS surface becomes highly hydrophilic, suitable for secondary protein immobilization.
- Specific residues (Leu12, Leu24, Leu26, Ile27, Ala66, Leu68) are critical for HFBI adsorption on hydrophobic substrates.
