
TY  - JOUR
A1  - Zanacchi, RM 
A1  - Moore, WJ 
T1  - Temperature and pH dependence of proton N.M.R. of glutamine in peptides
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1980
VL  - 33
IS  - 7
SP  - 1505
EP  - 1510
KW  - 
UR  - https://doi.org/10.1071/CH9801505 
N2  - The proton n.m.r. spectra of the peptides Ala-Glu-Gly-Gln-Gly and Gly- Gln-Gly as measured in dimethyl sulfoxide over a range of temperatures yielded kinetic parameters for rotation about the carbon-nitrogen bonds of the glutamine side chains of &#916;H&#8225; 71.6 kJ mol-1, &#916;S&#8225; 2.1 J mol-1 K-1, and &#916;H&#8225;/70.6 kJ mol-1, &#916;S&#8225; -0.5 J mol-1 K-1, respectively, at 298 K. On pH titration in dimethyl sulfoxide/water solutions, the chemical shifts of the cis protons of the glutamine amide remained constant whereas those of the trans protons were altered with a pK corresponding to that of the terminal glycine. 
ER  -

