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• W2103707410 abstract "Abstract Guanine tetraplexes are biological non‐covalent systems stabilized by alkali cations. Thus, self‐clustering of guanine, xanthine and hypoxanthine with alkali cations (Na + , K + and Li + ) is investigated by electrospray ionization mass spectrometry (ESI‐MS) in order to provide new insights into G‐quartets, hydrogen‐bonded complexes. ESI assays displayed magic numbers of tetramer adducts with Na + , Li + and K + , not only for guanine, but also for xanthine bases. The optimized structures of guanine and xanthine quartets have been determined by B3LYP hybrid density functional theory calculations. Complexes of metal ions with quartets are classified into different structure types. The optimized structures obtained for each quartet explain the gas‐phase results. The gas‐phase binding sequence between the monovalent cations and the xanthine quartet follows the order Li + > Na + > K + , which is consistent with that obtained for the guanine quartet in the literature. The smallest stabilization energy of K + and its position versus the other alkali metal ions in guanine and xanthine quartets is consistent with the fact that the potassium cation can be located between two guanine or xanthine quartets, for providing a [gua(or (xan)) 8 +K] + octamer adduct. Even if an abundant octamer adduct with K + for xanthine was detected by ESI‐MS, it was not the case for guanine. Copyright © 2007 John Wiley & Sons, Ltd." @default.
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• W2103707410 date "2007-02-20" @default.
• W2103707410 modified "2023-10-15" @default.
• W2103707410 title "Theoretical and gas-phase studies of specific cationized purine base quartet" @default.
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• W2103707410 doi "https://doi.org/10.1002/rcm.2934" @default.
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