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Environmental effect on surface immobilized biological molecules.

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Summary
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Antimicrobial peptides like cecropin P1 change structure when exposed to trifluoroethanol/water mixtures. This peptide adopts a linear, upright alpha-helical structure, enabling control over surface functionality for microbial detection.

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Area of Science:

  • Biophysics
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Immobilized antimicrobial peptides (AMPs) show altered behavior in different environments.
  • Previous experiments showed cecropin P1 (cCP1) has different conformations in water versus TFE/water mixtures.
  • Molecular dynamics (MD) simulations revealed cCP1 lies bent on a surface in pure water.

Purpose of the Study:

  • To investigate the effect of a 50% trifluoroethanol (TFE)/water mixture on the structure and orientation of immobilized cCP1.
  • To understand how environmental changes influence interfacial peptide behavior.
  • To correlate simulation findings with experimental sum frequency generation (SFG) data.

Main Methods:

  • Molecular dynamics (MD) simulations of cCP1 immobilized on a self-assembled monolayer (SAM) surface.
  • Simulations were conducted in a 50% (v/v) TFE/water mixture.
  • Comparison with previous SFG experiments and MD simulations in pure water.

Main Results:

  • Immobilized cCP1 adopted a linear alpha-helical structure, standing upright on the SAM surface in the TFE/water mixture.
  • This upright conformation was achieved regardless of the peptide's initial conformation or orientation.
  • TFE aggregation created local hydrophobic environments that mediated the peptide's conformational change.

Conclusions:

  • The surrounding chemical environment, specifically TFE-induced hydrophobicity, dictates the surface conformation of immobilized peptides.
  • Surface conformation and functionality of AMPs can be regulated by altering the surrounding chemical environment.
  • This knowledge is crucial for developing surface-immobilized AMPs for applications like microbial detection and killing.