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1
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Sargolzaei M, Nikoofard H, Jorabchi MN. Quantum-Chemical ab initio Study of Side Chain pKa of Linear and Cyclic Lysine Dipeptides. JOURNAL OF COMPUTATIONAL BIOPHYSICS AND CHEMISTRY 2021. [DOI: 10.1142/s2737416520420028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Cyclic dipeptides show interesting biological activities such as antitumor, antiviral and so on. In biological systems, the bioavailability of drugs is determined by several parameters such as pKa values. In this study, we used DFT and thermodynamics cycle to determine pKa value of side chain of lysine in linear and cyclic dipeptides. All considered dipeptides were optimized using B3LYP and RMSD tool was used to compare the optimized structures. The calculated pKa values were compared with the available experimental data. Our results show that pKa of side chain of lysine increases for cyclic dipeptides compared to the linear ones. To justify the reason of increasing of pKa of cyclic dipeptides, we used NBO and AIM analyses. The analyses showed that a hydrogen bond in cyclic lysine dipeptides is responsible for increasing of pKa.
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Affiliation(s)
- Mohsen Sargolzaei
- Faculty of Chemistry, Shahrood University of Technology, Shahrood, Iran
| | - Hossein Nikoofard
- Faculty of Chemistry, Shahrood University of Technology, Shahrood, Iran
| | - Majid Namayandeh Jorabchi
- University of Rostock, Institute of Chemistry, Physical and Theoretical Chemistry, Albert-Einstein-Straße 21, 18059 Rostock, Germany
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2
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Zonouzi F, Shayesteh A, Alizadeh T, Dezhampanah H, Ghalami‐Choobar B, Zonouzi A. Determination of
pK
a
values for (
E
)‐2‐hydroxy‐5‐(aryldiazenyl) benzaldehydes in dimethyl sulfoxide: Cyclic voltammetry and density functional theory calculations. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.201800472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Forouzan Zonouzi
- Department of ChemistryUniversity campus 2, University of Guilan Rasht Iran
| | - Alireza Shayesteh
- School of Chemistry, College of ScienceUniversity of Tehran Tehran Iran
| | - Taher Alizadeh
- School of Chemistry, College of ScienceUniversity of Tehran Tehran Iran
| | - Hamid Dezhampanah
- Department of ChemistryUniversity campus 2, University of Guilan Rasht Iran
- Department of Chemistry, Faculty of ScienceUniversity of Guilan Rasht Iran
| | - Bahram Ghalami‐Choobar
- Department of ChemistryUniversity campus 2, University of Guilan Rasht Iran
- Department of Chemistry, Faculty of ScienceUniversity of Guilan Rasht Iran
| | - Afsaneh Zonouzi
- School of Chemistry, College of ScienceUniversity of Tehran Tehran Iran
- Pharmaceutical and Cosmetic Research Center (PCRC)University of Tehran Tehran Iran
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