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This study introduces a multiscale computational protocol to simulate spectroscopic properties of zwitterionic l-tryptophan in water. The method accurately predicts electronic, magnetic, and vibrational spectra, validating its effectiveness for molecular simulations.

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Area of Science:

  • Computational Chemistry
  • Spectroscopy
  • Molecular Modeling

Background:

  • Accurate simulation of molecular properties in solution is crucial for understanding chemical and biological processes.
  • Zwitterionic amino acids, like l-tryptophan, exhibit complex spectroscopic behaviors influenced by their environment.
  • Previous computational methods often struggle to balance accuracy and efficiency for solvated systems.

Purpose of the Study:

  • To develop and validate a multiscale computational protocol for simulating diverse spectroscopic properties of zwitterionic l-tryptophan in aqueous solution.
  • To assess the impact of different polarizable embedding models on the accuracy of calculated electronic, magnetic, and vibrational spectra.
  • To provide a reliable computational tool for studying amino acids and other biomolecules in physiological conditions.

Main Methods:

  • A multiscale approach combining Density Functional Theory (DFT) for the solute with polarizable embedding models (QM/FQ and QM/FQFμ) for the solvent.
  • Extensive conformational sampling using classical molecular dynamics.
  • Calculation of UV-vis, Electronic Circular Dichroism (ECD), Nuclear Magnetic Resonance (NMR), Infrared (IR), Raman, and Resonance Raman Optical Activity (ROA) spectra.

Main Results:

  • The protocol successfully reproduced experimental UV-vis and ECD spectra, including key electronic transitions and chiroptical features.
  • Accurate prediction of negative optical rotation at the sodium D-line was achieved.
  • Computed NMR chemical shifts and vibrational spectra (IR, Raman, ROA) showed good agreement with experimental data, highlighting the importance of accurate solvent treatment.

Conclusions:

  • The developed multiscale computational protocol provides a robust framework for simulating a wide range of spectroscopic properties of zwitterionic molecules in solution.
  • The QM/FQFμ model offers improved accuracy over QM/FQ, particularly for chiroptical and magnetic properties, emphasizing the significance of including solvent polarizability and dipole response.
  • This approach serves as a valuable tool for theoretical investigations in computational chemistry, biochemistry, and biophysics.