Influence of lithium cations on prolyl peptide bonds
Influence of lithium cations on prolyl peptide bonds
复制标题
锂阳离子对脯氨酰肽键的影响
DOI:
10.1002/psc.2410
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发表时间:
2012
影响因子:
2.1
通讯作者:
Hofmann H-J
中科院分区:
文献类型:
--
作者:
Kunz C;Jahreis G;Günther R;Berger S;Fischer G;Hofmann H-J
The influence of lithium cations on thecis/transisomerization of prolyl peptide bonds was investigated in a quantitative manner in trifluoroethanol (TFE) and acetonitrile, employing NMR techniques. The focus was on various environmental and structural aspects, such as lithium cation and water concentrations, the type of the partner amino acid in the prolyl peptide bond, and the peptide sequence length.Comparison of the thermodynamic parameters of the isomerization in LiCl/TFE and TFE shows a lithium cation concentration dependence of thecis/transratio, which saturates at cation concentrations >200 mM. A pronounced increase in thecisisomer content in the presence of lithium cations occurs with the exception of peptides with Gly‐Pro and Asp‐Pro moieties. The cation effect appears already at the dipeptide level. The salt concentration can considerably be reduced in solvents with a lower number of nucleophilic centers like acetonitrile. The lithium cation effect decreases with small amounts of water and disappears at a water concentration of about 5%. The isomerization kinetics under the influence of lithium cations suggests a weak cation interaction with the carbonyl oxygen of the peptide bond. Copyright © 2012 European Peptide Society and John Wiley & Sons, Ltd.
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影响因子:
15
作者:
C. Perrin;R. Gipe
通讯作者:
R. Gipe
影响因子:
2.9
作者:
G. Žoldák;T. Aumüller;C. Lücke;Jozef Hritz;C. Oostenbrink;G. Fischer;F. Schmid
通讯作者:
F. Schmid
影响因子:
15
作者:
Hur, S;Bruice, TC
通讯作者:
Bruice, TC
影响因子:
2.7
作者:
Ghasemi, Mehdi;Sadeghipour, Hamed;Dehpour, Ahmad Reza
通讯作者:
Dehpour, Ahmad Reza
DOI:
10.1515/znc-1980-5-623
发表时间:
1980
期刊:
Zeitschrift für Naturforschung C
影响因子:
--
作者:
A. Johnsson;W. Engelmann;Burkhard Pflug;W. Klemke
通讯作者:
W. Klemke