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• W2087435912 abstract "The spectroscopic properties (uv, CD, nmr) of histidine, glycylhistidine, histidylglycine, glycylhistidylglycine have been investigated in water and methanol in the temperature range 200-320 K in order to obtain information about their conformational equilibria. This analysis has been carried out for the different ionic forms of the compounds, in order to evaluate the influence of the ionization state of the carboxyl, histidyl, and amino groups on the rotamer distribution of the histidyl side chain (as evaluated from proton nmr analysis) and on the overall molecule (as judged from CD spectra). On the basis of certain approximations and from the temperature dependence of the proton nmr resonance, the thermodynamic parameters (ΔH° and ΔS°) characterizing the conformational equilibrium of the hystidyl side chain have been evaluated for the different structures and ionization states. Relatively large entropy differences between the rotamers are obtained in some cases. The data of the sidechain rotamer population, as determined by nmr, have been analytically correlated with the CD data, and in the case of hystidine and histidylglycine in basic solution, first-approximation values for the ellipticity of the single conformers have been evaluated. Finally, in the example of glycylhistidine and histidylglycine in basic solution, it is shown how the data obtained from the different experimental approaches (nmr and CD), as well as from theoretical energy calculations, converge to characterize the most stable conformation in solution." @default.
• W2087435912 created "2016-06-24" @default.
• W2087435912 creator A5037927755 @default.
• W2087435912 creator A5078090441 @default.
• W2087435912 date "1981-01-01" @default.
• W2087435912 modified "2023-09-24" @default.
• W2087435912 title "XII. Conformational studies of histidine-containing peptides in solution" @default.
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• W2087435912 doi "https://doi.org/10.1002/bip.1981.360200106" @default.
• W2087435912 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33327678" @default.
• W2087435912 hasPublicationYear "1981" @default.
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