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Valinomycin is shown to form a stable complex with protons in the form of H3O+ ions. Using 1H and 13C nuclear magnetic resonance (NMR), Fourier transform (FT) infrared spectroscopy, and ab initio–density functional theory (DFT) quantum mechanical calculations, it is shown that H3O+, produced by...
A new ester of Monensin A with ethylene glycol (MON2) has been synthesized by a new method and its ability to form complexes with Li+, Na+, and K+ cations has been studied by ESI MS, 1H and 13C NMR, FT–IR, and PM5 semiempirical methods. It is demonstrated that MON2 forms stable complexes of 1:1...
Noncovalent chiral domino effect (NCDE) has been proposed as terminal‐specific interaction upon a 310‐helical peptide chain, of which the helix sense is manipulated by an external chiral stimulus (mainly amino acid derivatives) operating on the N‐terminus (Inai, Y., et al. J Am Chem Soc...
A new Schiff base of gossypol with 5‐methoxytryptamine (GSTR) and a new hydrazone of gossypol with dansylhydrazine (GHDH) have been synthesized and studied by Fourier transform infrared (FTIR), 1H and 13C nuclear magnetic resonance (NMR), ultraviolet‐visible (UV‐VIS), electrospray...
Cancer cells escape cytotoxic effects of anticancer drugs by a process known as multidrug resistance (MDR). Identification of cell status by less time‐consuming methods can be extremely useful in patient management and treatment. This study aims at evaluating the potentials of vibrational...
Molecular dynamics (MD) simulations were employed to investigate the structure, dynamics, and local base‐pair step deformability of the free 16S ribosomal helix 44 from Thermus thermophilus and of a canonical A‐RNA double helix. While helix 44 is bent in the crystal structure of the small...
Structural understanding of DNA triplexes is grossly inadequate despite their efficacy as therapeutic agents. Lack of structural similarity (isomorphism) of base triplets that figure in different DNA triplexes brings in an added complexity. Recently, we have shown that the residual twist (Δt°)...
In a previous study we examined by the exciton‐coupled circular dichroic method the distance effect generated by three‐rigid‐turn and helical‐peptide spacers. In this connection porphyrins were confirmed to be excellent reporter chromophores. In the present investigation we have completed...
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