作者:Jakas, Andreja、Ayyalasomayajula, Ramya、Cudic, Mare
DOI:10.1016/j.carres.2024.109195
日期:——
sugars are known as Maillard reaction. The late phase of these reactions consists of advanced glycation end products (AGEs), which have been implicated in the pathogenesis of numerous human diseases. Recent evidence suggests that galectin-3 acts as a receptor for AGEs and some early products of the Maillard reaction. The early phase of the Maillard reaction, which consists of 1-amino-1-deoxyketoses
Glycation of a lysine-containing tetrapeptide by d-glucose and d-fructose—influence of different reaction conditions on the formation of Amadori/Heyns products
The site specificity, extent, and nature of modification of the tetrapeptide, Leu-Ser-Lys-Leu (1), incubated with D-glucose or D-fructose in methanol, or in phosphate buffer of pH 5.7, 7.4, and 8.0 were investigated. The generated mono- and di-glycated Amadori (1-deoxy-D-fructosyl derivatives) and Heyns rearrangement products (N-alkylated glucosamine/mannosamine derivatives) were isolated and characterized by NMR and mass spectrometry. The results identified the epsilon-amino group of the Lys residue as the preferential glycation site in tetrapeptide 1. Under all conditions investigated, glucose afforded higher yields of glycation products than fructose. In the reactions carried out in buffer, glycation at pH 7.4 and 8.0 was much faster than at pH 5.7. (C) 2008 Elsevier Ltd. All rights reserved.
Modification of N-Terminal α-Amino Groups of Peptides and Proteins Using Ketenes
作者:Anna On-Yee Chan、Chi-Ming Ho、Hiu-Chi Chong、Yun-Chung Leung、Jie-Sheng Huang、Man-Kin Wong、Chi-Ming Che
DOI:10.1021/ja208009r
日期:2012.2.8
of highly selective N-terminal modification of proteins as well as peptides by an isolated ketene was developed. Modification of a library of unprotected peptides XSKFR (X varies over 20 natural amino acids) by an alkyne-functionalized ketene (1) at room temperature at pH 6.3 resulted in excellent N-terminal selectivity (modified α-amino group/modified ε-amino group = >99:1) for 13 out of the 20 peptides