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- W2023409895 abstract "We present evidence for structures of two ordered forms of polyxanthylic acid based on ir spectroscopy, pH titrations, and thermal transitions. Over the pH range ∼6–9.5, the structure is a four-stranded helix with alkali metal ions specifically complexed in the central channel. These internal counterions stabilize the structure by complexing with carbonyl oxygens and by partial screening of electrostatic repulsion caused by ionization of the xanthine residues in this pH range. Below pH 5, the structure is quite different and much more stable. Our data are consistent with a six-stranded helix in which both carbonyl oxygens and both NH protons are hydrogen bonded." @default.
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- W2023409895 date "1979-12-01" @default.
- W2023409895 modified "2023-09-23" @default.
- W2023409895 title "Polyxanthylic acid: structures of the ordered forms" @default.
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- W2023409895 doi "https://doi.org/10.1002/bip.1979.360181213" @default.
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