International Journal of Advanced Culture Technology

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Comparison of Structural Types of Proline Pentamer by Quantum Chemical Calculation (QCC)

  • Jae-Ho Sim (Dept. of Advanced Materials & Chemical Engineering, Halla University)
  • Received : 2023.04.07
  • Accepted : 2023.05.11
  • Published : 2023.06.30
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Abstract

In this study, Proline pentamer model was used to investigate change in the dihedral angle, intramolecular hydrogen bonding and formation energies during structural optimization. L-Proline (LP, as an imino acid residue) pentamers having four conformation types [β: φ/ψ=t−/t+, α: φ/ψ=g−/g−, PPII: φ/ψ=g−/t+ and Plike: φ/ψ= g−/g+] were carried out by QCC [B3LYP/6-31G(d,p)]. The optimized structure and formation energy were examined for designated structure. In LP, P-like and PPII types did not change by optimization, and β types were transformed into PPII having no H-bond independently of the designated ψ values. PPII was more stable than P-like by about 2.2 kcal/mol/mu. The hydrogen bond distances of d2(4-6) type H-bonds were 1.94 - 2.00Å. In order to understand the processes of the transformations, the changes of φ/ψ, distances of NH-OC (dNH/CO) and formation energies (ΔE, kcal/mol/mu) were examined.

Keywords

Acknowledgement

This work was supported by a research grant from Halla University in 2023.

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