Nucleic acid triggered catalytic drug and probe release: A new concept for the design of chemotherapeutic and diagnostic agents
作者:Z Ma
DOI:10.1016/s0968-0896(01)00245-0
日期:2001.9
antiviral and anticancer chemotherapeutic agents that makes use of a disease-specific nucleicacid sequence to template the association of a prodrug with a catalyst which catalyzes the release of the drug. Herein, we report on the effect of mismatches, sterics, and electronics on the rate and specificity of drug and probe release in both two and three component model systems, and on the stability of the
Genetic Engineering of an Artificial Metalloenzyme for Transfer Hydrogenation of a Self-Immolative Substrate in <i>Escherichia coli’</i>s Periplasm
作者:Jingming Zhao、Johannes G. Rebelein、Hendrik Mallin、Christian Trindler、Michela M. Pellizzoni、Thomas R. Ward
DOI:10.1021/jacs.8b07189
日期:2018.10.17
transformations. To complement the natural enzymes' repertoire, effective optimization protocols to improve ArM's performance are required. Here we report on our efforts to optimize the activity of an artificial transfer hydrogenase (ATHase) using Escherichia coli whole cells. For this purpose, we rely on a self-immolative quinolinium substrate which, upon reduction, releases fluorescent umbelliferone
人工金属酶 (ArMs) 将非生物金属辅因子与蛋白质支架相结合,催化各种合成有用的转化。为了补充天然酶的库,需要有效的优化协议来提高 ArM 的性能。在这里,我们报告了我们使用大肠杆菌全细胞优化人工转移氢化酶 (ATHase) 活性的努力。为此,我们依靠自焚喹啉底物,该底物在还原时释放荧光伞形酮,从而实现有效筛选。与使用纯化突变体的野生型 ATHase 相比,在紧邻 Ir 辅因子的位置引入环使 ArM 的转移氢化活性提高了多达 5 倍。
A new fluorogenic probe for the selective detection of carbon monoxide in aqueous medium based on Pd(0) mediated reaction
A coumarin-based fluorogenic probe, PCO-1, detects carbon monoxide selectively in buffer at pH 8.0 through the intramolecular cyclization–elimination pathway based on Pd(0) mediated reaction.
Kinetics of Self-Immolation: Faster Signal Relay over a Longer Linear Distance?
作者:Ho Yong Lee、Xuan Jiang、Dongwhan Lee
DOI:10.1021/ol900433g
日期:2009.5.21
A counterintuitive observation of a faster signal relay over a longer linear distance prompted detailed kinetic studies of self-immolation reactions. With appropriate conformational bias, trigger-to-reporter signal transduction can take an efficient "shortcut" that outperforms conventional pathways involving repetitive quinone methide rearrangements and elimination.
Controlled Ligand Exchange Between Ruthenium Organometallic Cofactor Precursors and a Naïve Protein Scaffold Generates Artificial Metalloenzymes Catalysing Transfer Hydrogenation
作者:George S. Biggs、Oskar James Klein、Sarah L. Maslen、J. Mark Skehel、Trevor J. Rutherford、Stefan M. V. Freund、Florian Hollfelder、Sally R. Boss、Paul D. Barker
DOI:10.1002/anie.202015834
日期:2021.5.3
ligand exchange to unmask catalytic activity. By systematically testing RuII(η6‐arene)(bipyridine) complexes designed to facilitate the displacement of functionalised bipyridines, we develop a fast and robust procedure for generating new enzymes via ligand exchange in a protein that has not evolved to bind such a complex. The resulting metal cofactors form peptidic coordination bonds but also retain
许多天然金属酶由蛋白质和生物合成复合物组装而成,通过改变金属配位产生有效的催化剂。在这里,我们采用相同的策略,利用配体交换来生成人工金属酶(ArM),以揭示催化活性。通过系统地测试旨在促进功能化联吡啶置换的 Ru II (η 6芳烃)(联吡啶)复合物,我们开发了一种快速而稳健的程序,通过在尚未进化到结合此类复合物的蛋白质中通过配体交换来生成新酶。所得金属辅助因子形成肽配位键,但也保留非生物配体。使用串联质谱和19 F NMR 光谱来表征有机金属辅因子并鉴定蛋白质衍生的配体。通过将钌辅助因子引入 4 螺旋束,生成了转移氢化催化剂,与溶液中的相应小分子反应相比,其速率提高了 35 倍。