Coupling of sterically demanding peptides by β-thiolactone-mediated native chemical ligation
作者:Huan Chen、Yunxian Xiao、Ning Yuan、Jiaping Weng、Pengcheng Gao、Leonard Breindel、Alexander Shekhtman、Qiang Zhang
DOI:10.1039/c7sc04744d
日期:——
The ligation of sterically demanding peptidyl sites such as those involving Val–Val and Val–Pro linkages has proven to be extremely challenging with conventional NCL methods that rely on exogenous thiol additives. Herein, we report an efficient β-thiolactone-mediated additive-free NCL protocol that enables the establishment of these connections in good yield. The rapid NCL was followed by in situ desulfurization
空间要求高的肽基位点(例如涉及 Val-Val 和 Val-Pro 连接的肽基位点)已被证明对于依赖外源硫醇添加剂的传统 NCL 方法极具挑战性。在此,我们报告了一种高效的 β-硫内酯介导的无添加剂 NCL 方案,该方案能够以良好的产量建立这些连接。快速 NCL 后进行原位脱硫。还研究了 β-硫内酯和常规硫酯之间对 NCL 的反应速率,并排除了直接氨解作为可能的途径。最后,使用所开发的方法制备了有效的细胞毒性环肽 axinastatin 1。