Abstract
The interactions of L-aminoglucosidic stereoisomers such as rhodostreptomycins A (Rho A) and B (Rho B) with cations (Mg2+, Ca2+, and H+) were studied by a quantum mechanical method that utilized DFT with B3LYP/6-311G**. Docking studies were also carried out in order to explore the surface recognition properties of L-aminoglucoside with respect to Mg2+ and Ca2+ ions under solvated and nonsolvated conditions. Although both of the stereoisomers possess similar physicochemical/antibiotic properties against Helicobacter pylori, the thermochemical values for these complexes showed that its high affinity for Mg2+ cations caused the hydration of Rho B. According to the results of the calculations, for Rho A–Ca2+(H2O)6, ΔH = −72.21 kcal mol−1; for Rho B–Ca2+(H2O)6, ΔH = −72.53 kcal mol−1; for Rho A–Mg2+(H2O)6, ΔH = −72.99 kcal mol−1 and for Rho B–Mg2+(H2O)6, ΔH = −95.00 kcal mol−1, confirming that Rho B binds most strongly with hydrated Mg2+, considering the energy associated with this binding process. This result suggests that Rho B forms a more stable complex than its isomer does with magnesium ion. Docking results show that both of these rhodostreptomycin molecules bind to solvated Ca2+ or Mg2+ through hydrogen bonding. Finally, Rho B is more stable than Rho A when protonation occurs.
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Their access to the KanBalam supercomputer at Dirección General de Cómputo y de Tecnologías de Información y Comunicación (DGTIC-UNAM) is greatly appreciated by the authors. Secretaria de Investigación y Posgrado, Comisión de Operación y Fomento de Actividades del Instituto Politécnicos Nacional, Consejo Nacional de Ciencia y Tecnología (CONACYT) y Instituto de Ciencia y Tecnología del Distrito Federal (ICyTDF).
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Jardínez, C., Nicolás-Vázquez, I., Cruz-Borbolla, J. et al. DFT and docking studies of rhodostreptomycins A and B and their interactions with solvated/nonsolvated Mg2+ and Ca2+ ions. J Mol Model 19, 4823–4836 (2013). https://doi.org/10.1007/s00894-013-1952-3
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DOI: https://doi.org/10.1007/s00894-013-1952-3