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- W2034095680 abstract "By means of carbon-13 nmr (at 25 MHz) the trans/cis conformer ratio in glycyl-L-proline has been measured in aqueous (D2O) solution over the temperature range 33–96°C. It is found that ΔH0 = −4.2 kJ/mole and ΔS0 = −9.7 J/mole/K. Measurements of the T1 values for the proline ring carbons yielded values consistent with a fast puckering process involving both the β- and γ-carbons. Measurements of the rate of cis-trans conformational interconversion in glycyl-L-proline, using complete line-shape analysis for the glycyl α-carbon resonance, gave values for the trans → cis isomerization as follows: ΔH≠ = 83.5 ± 0.2 kJ/mole; ΔS≠ = 0.0 ± 10 J/mole/K. A more approximate determination from coalescence temperature observations gave a value of ΔG≠ of 82.0 ± 0.4 kJ/mole for this process in acetyl-L-proline in aqueous solution. The presence of 12M NaSCN lowered this barrier by ca. 2.6 kJ/mole. Such measurements are relevant to present theoretical models of the denaturation-renaturation processes in proteins, in which proline residues may play a key role." @default.
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- W2034095680 date "1977-07-01" @default.
- W2034095680 modified "2023-09-27" @default.
- W2034095680 title "Cis-Trans equilibrium and kinetic studies of acetyl-L-proline and glycyl-L-proline" @default.
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- W2034095680 doi "https://doi.org/10.1002/bip.1977.360160707" @default.
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