Synthesis of an Azido Precursor to (2<i>S</i>,5<i>R</i>)-5-Hydroxylysine Using an Asymmetric Organocatalytic Chlorination/Reduction Sequence
作者:Manuel Johannes、Margaret A. Brimble
DOI:10.1021/jo402220s
日期:2013.12.20
An efficient, robust, and scalable synthesis of an azido precursor to the modified amino acid (2S,5R)-5-hydroxylysine was developed on the basis of the use of a highly stereoselective organocatalytic alpha-chlorination-reduction protocol. The final Fmoc-protected (2S,5R)-6-azido-5-hydroxylysine derivative can be used in solid-phase peptide synthesis, providing access to proteins that contain large quantities of post-translationally modified lysine (e.g., collagens).
N-Glycosylated type II collagen peptides as therapeutic saccharide vaccines for rheumatoid arthritis
作者:Dake Liu、Shuyan Liu、Fanlei Hu、Zhongtang Li、Zhongjun Li
DOI:10.1016/j.cclet.2023.108762
日期:2024.5
interaction among type II collagen (CII), human DR4 major histocompatibility complex type II molecule (MHC II) and T-cell receptor (TCR) is associated with the development of rheumatoid arthritis (RA). The activation of T cells can be reduced through exposure to modified CII(263–272) glycopeptide fragment competitive inhibition with self-antigen. In this work, 30 peptides based on the sequence of CII(263–272)
II 型胶原 (CII)、人类 DR4 主要组织相容性复合体 II 型分子 (MHC II) 和 T 细胞受体 (TCR) 之间的相互作用与类风湿性关节炎 (RA) 的发生有关。通过暴露于修饰的 CII(263–272) 糖肽片段与自身抗原的竞争性抑制,可以减少 T 细胞的活化。在这项工作中,制备了 30 种基于 CII(263-272) 序列的肽,并通过表面等离子共振 (SPR) 测定评估了它们与 DR4 蛋白的结合。还研究了胶原诱导的类风湿性关节炎(CIA)小鼠脾细胞对促炎因子分泌的影响。两个-糖基化的CII肽被鉴定为与人重组DR4蛋白具有强结合力并且具有弱的促炎作用。这些糖肽可以开发为治疗类风湿性关节炎(RA)的治疗性糖疫苗。