Chemoselective Peptide Modification via Photocatalytic Tryptophan β-Position Conjugation
作者:Younong Yu、Li-Kang Zhang、Alexei V. Buevich、Guoqing Li、Haiqun Tang、Petr Vachal、Steven L. Colletti、Zhi-Cai Shi
DOI:10.1021/jacs.8b03973
日期:2018.6.6
achieve high levels of selectivity for peptide or protein modification. A chemoselectivepeptide modification method via photocatalytic tryptophan β-position conjugation has been discovered. This transformation has good substrate scope for both peptide and Michael acceptor, and has good chemoselectivity versus other amino acid residues. The endogenous peptides, glucagon and GLP-1 amide, were both successfully
靶向色氨酸是实现肽或蛋白质修饰高水平选择性的有前途的策略。已经发现了一种通过光催化色氨酸 β 位缀合进行化学选择性肽修饰的方法。这种转化对肽和迈克尔受体都具有良好的底物范围,并且对其他氨基酸残基具有良好的化学选择性。内源性肽、胰高血糖素和 GLP-1 酰胺都在色氨酸 β 位成功结合。胰岛素被研究为非色氨酸控制分子,导致排他的 B 链 C 端选择性脱羧结合。这种转化为肽修饰提供了一种新方法,以支持新治疗肽、蛋白质标记和生物偶联的发现。
A new GLP-1 analogue with prolonged glucose-lowering activity in vivo via backbone-based modification at the N-terminus
作者:Xiaohui Bai、Youhong Niu、Jingjing Zhu、An-Qi Yang、Yan-Fen Wu、Xin-Shan Ye
DOI:10.1016/j.bmc.2016.01.036
日期:2016.3
Glucagon-like peptide-1 (GLP-1) is an endogenous insulinotropic hormone with wonderful glucose-lowering activity. However, its clinical use in type II diabetes is limited due to its rapid degradation at the N-terminus by dipeptidyl peptidase IV (DPP-IV). Among the N-terminal modifications of GLP-1, backbone-based modification was rarely reported. Herein, we employed two backbone-based strategies to modify the N-terminus of tGLP-1. Firstly, the amide N-methylated analogues 2-6 were designed and synthesized to make a full screening of the N-terminal amide bonds, and the loss of GLP-1 receptor (GLP-1R) activation indicated the importance of amide H-bonds. Secondly, with retaining the N-terminal amide H-bonds, the beta-peptide replacement strategy was used and analogues 7-13 were synthesized. By two rounds of screening, analogue 10 was identified. Analogue 10 greatly improved the DPP-IV resistance with maintaining good GLP-1R activation in vitro, and showed approximately a 4-fold prolonged blood glucose-lowering activity in vivo in comparison with tGLP-1. This modification strategy will benefit the development of GLP-1-based anti-diabetic drugs. (C) 2016 Elsevier Ltd. All rights reserved.
Phosphine-Dependent Photoinitiation of Alkyl Thiols under Near-UV Light Facilitates User-Friendly Peptide Desulfurization
作者:Naresh M. Venneti、Ganesh Samala、Rana M. I. Morsy、Lawrence G. Mendoza、Albert Isidro-Llobet、Janine K. Tom、Subha Mukherjee、Michael E. Kopach、Jennifer L. Stockdill
DOI:10.1021/jacs.2c10625
日期:2023.1.18
excesses of phosphine reagents and thiol additives or low-abundance metal catalysts. Here, we report a phosphine-only photodesulfurization (POP) using near-UV light that is clean, high-yielding, and requires as little as 1.2 equiv phosphine. The user-friendly reaction gives complete control to the chemist, allowing solvent and reagent selection based on starting material and phosphine solubility. It
肽作为药物靶点的重要性正在稳步上升,因此迫切需要高效、绿色的制备方法。合成工具箱中的一个关键缺陷是缺乏工业上可行的肽脱硫方法。如果没有这个工具,通常用于组装多肽和蛋白质的强大的天然化学连接反应仍然无法用于药物靶点的工业制备。目前的脱硫方法需要大量过量的膦试剂和硫醇添加剂或低丰度金属催化剂。在这里,我们报告了一种使用清洁、高产且低至 1.2 当量磷化氢的近紫外光的仅磷化氢光脱硫 (POP)。用户友好的反应给化学家完全控制,允许根据起始材料和膦溶解度选择溶剂和试剂。它可以在一系列溶剂中进行,包括水或缓冲液、受保护或未受保护的肽、低稀释度或高稀释度以及克规模。易氧化的氨基酸、π键、芳香环、硫胺键、硫酯和聚糖都对 POP 反应稳定。我们强调了这种方法对工业相关目标脱硫的效用,包括环肽和胰高血糖素样肽 1 (GLP-1(7-36))。该方法还与 NCL 缓冲液兼容,我们通过利那洛肽、抑肽酶和小麦蛋白