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Zwitterionic structures of selenocysteine-containing dipeptides and their interactions with Cu(II) ions

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Abstract

The molecular structures of a series of selenocysteine-containing dipeptides in their zwitterionic forms were studied using the B3LYP/6-311++G(d,p) level in the aqueous phase. The B3LYP and BH and HLYP functionals in combination with 6-311++G(d,p) and LANL2DZ basis sets were used to investigate the effects of metal coordination on the structural and molecular properties of the dipeptides by complexing them with bivalent copper ions. The results from this DFT study provide valuable insights into the interaction enthalpies (metal ion-binding affinities) and free energies, the influence of the C-terminal moiety on the backbone structural features, the existence of various types of intramolecular H-bond interactions, harmonic vibrational frequencies, along with various other electronic properties pertaining to the zwitterions of the dipeptide molecules as well as their metallic complexes. Metal coordination via the carboxylate groups tends to enhance the planarity of the amide planes. The participations of the N- and C-terminal side-chain moieties in metal-binding markedly enhance the thermodynamic stability of the metalated dipeptides. The theoretical λmaxvalues, calculated using the TD/DFT level for all the systems, well represent the occurrence of d-d transitions in the Cu-dipeptide complexes.

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  1. Department of Chemistry, North Eastern Hill University, Shillong, 793022, India

    Gunajyoti Das & Shilpi Mandal

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Das, G., Mandal, S. Zwitterionic structures of selenocysteine-containing dipeptides and their interactions with Cu(II) ions. Chem. Pap. 69, 616–626 (2015). https://doi.org/10.1515/chempap-2015-0064

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