Hydrogen−Deuterium Exchange and Selective Labeling of Deprotonated Amino Acids and Peptides in the Gas Phase
作者:Zhixin Tian、Lev Lis、Steven R. Kass
DOI:10.1021/ja076599l
日期:2008.1.1
Hydrogen-deuterium exchange reactions of deprotonated aminoacids and small peptides were studied. Selective labeling can be carried out at the alpha-amino group of lysine (2 of 4 labile hydrogens undergo exchange with CF3CH2OD) and the guanidine sidechain of arginine (3 of 6 labile hydrogens undergo exchange with CH3CH2OD and C6H5CH2OD). Differential labeling of peptides also was accomplished, and the extent of
Thermodynamic studies about the interaction of scorpiand aza-macrocycles with amino acids in water show entropy driven stabilisations often associated with solvation/desolvation processes.