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- W1963550232 abstract "1H NMR saturation transfer and T1 experiments were used to monitor the amide hydrogen exchange rates of 2,5-piperazinedione (diketopiperazine, DKP) and 2-piperidone (δ-valerolactam) in water. Specific acid-catalyzed exchange rate constants (kH) for δ-valerolactam and DKP are quite similar, but DKP exhibits an approximately 740-fold larger specific base-catalyzed rate constant (kOH) at 25 °C, which approaches the diffusion limit. The rate constants for DKP are larger than expected from simple inductive effects. The enhanced rate constants for DKP are attributed to electrostatic interactions involving the second peptide group. In general, the exchange data and inspection of protein structures suggest that such electrostatic interactions may have significant effects on hydrogen exchange in proteins." @default.
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- W1963550232 date "1996-01-01" @default.
- W1963550232 modified "2023-09-25" @default.
- W1963550232 title "Intramolecular Electrostatic Interactions Accelerate Hydrogen Exchange in Diketopiperazine Relative to 2-Piperidone" @default.
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- W1963550232 doi "https://doi.org/10.1021/ja952892m" @default.
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