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Conformational analysis of glutamic acid: a density functional approach using implicit continuum solvent model.

Başak Turan1, Cenk Selçuki

  • 1Graduate School of Natural and Applied Sciences, Biochemistry Department, Ege University, 35100, Bornova, Izmir, Turkey.

Journal of Molecular Modeling
|August 20, 2014
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Summary

Glutamic acid exists in multiple forms, with neutral structures being more stable in water than charged ones. Hydrogen bonding significantly influences the stability of these amino acid conformers.

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Area of Science:

  • Biochemistry
  • Computational Chemistry

Background:

  • Amino acids are fundamental building blocks of proteins and enzymes.
  • Glutamic acid's charged side chain is crucial for protein interactions.

Purpose of the Study:

  • To conduct a comprehensive conformational analysis of all eight possible forms of glutamic acid.
  • To investigate the stability of glutamic acid structures in aqueous solution.

Main Methods:

  • Utilized B3LYP/cc-pVTZ level calculations for conformational analysis.
  • Employed the polarizable continuum model (PCM) to simulate a water solvent.
  • Classified conformers into nine families based on dihedral angles.

Main Results:

  • Neutral glutamic acid structures show greater stability in solution compared to vacuum.
  • Some calculated forms are unstable in solution and convert to more stable configurations.
  • Electrostatic solvent effects favor charged forms, but hydrogen bonding impacts stability.

Conclusions:

  • Compact neutral glutamic acid forms are more stable in aqueous solution.
  • The stability of zwitterionic forms may be underestimated due to limited solute-solvent hydrogen bonding.
  • Further studies with explicit solvent models are needed to fully understand charged glutamic acid stability.