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• W2012068462 endingPage "14523" @default.
• W2012068462 startingPage "14515" @default.
• W2012068462 abstract "Interactions of adenine, cytosine, guanine, and thymine with Na(+), Mg(2+), and Zn(2+) cations were studied using an approximate resolution of identity correlated second-order MP2 (RI-MP2) method with the TZVPP ([5s3p2d1f/3s2p1d]) basis set. All existing tautomers of adenine, cytosine, and thymine and the eight most stable keto/enol tautomers of guanine were considered. Cations bind mostly in a bidentate manner, and stabilization energies of these complexes are larger than those in the case when cations bind in a unidentate manner. The cation...Y (Y equal to N or O) distances for divalent metals are shorter than those for Na(+) and for Zn(2+) are mostly shorter than the Mg(2+)...Y distance. The intermolecular distances between the cation and the base for complexes containing adenine and cytosine are systematically shorter than those for complexes containing guanine and thymine. Only for cytosine the canonical keto/amino tautomer structure with ions represents the global minimum. For guanine, the metalated canonical form is again the most stable, but its stabilization energy is within less than 5% of the stabilization energies of the two other rare tautomers, which indicates that the canonical form and these two rare tautomers could coexist. The canonical structures of adenine and thymine in the presence of ions are considerably less stable (by more than 10%) than the complexes of the rare tautomers. It can be concluded that the interaction of Na(+), Mg(2+), and Zn(2+) cations with cytosine in the gas phase will not induce the change of the canonical form to the rare tautomeric form. In the case of isolated guanine, the equilibrium of the canonical form with rare tautomers can be found. For isolated adenine and thymine the presence of rare tautomers is highly probable." @default.
• W2012068462 created "2016-06-24" @default.
• W2012068462 creator A5004097152 @default.
• W2012068462 creator A5012381676 @default.
• W2012068462 date "2006-07-01" @default.
• W2012068462 modified "2023-09-30" @default.
• W2012068462 title "Na⁺, Mg²⁺, and Zn²⁺ Binding to All Tautomers of Adenine, Cytosine, and Thymine and the Eight Most Stable Keto/Enol Tautomers of Guanine: A Correlated ab Initio Quantum Chemical Study" @default.
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• W2012068462 doi "https://doi.org/10.1021/jp062249u" @default.
• W2012068462 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16854164" @default.
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