Double Nitroxide Labeling by Copper-Catalyzed Azide–Alkyne Cycloadditions with Noncanonical Amino Acids for Electron Paramagnetic Resonance Spectroscopy

Double Nitroxide Labeling by Copper-Catalyzed Azide–Alkyne Cycloadditions with Noncanonical Amino Acids for Electron Paramagnetic Resonance Spectroscopy
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用于电子顺磁共振波谱分析的铜催化叠氮化物-炔环加成与非规范氨基酸的双氮氧化物标记

DOI:
10.1021/acschembio.8b01111
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发表时间:
2019
影响因子:
4
通讯作者:
Malte Drescher
Malte Drescher
中科院分区:
生物学2区
文献类型:
--
作者:
Pia Widder;Frederic Berner;Daniel Summerer;Malte Drescher

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电子顺磁共振波谱结合定点自旋标记技术(SDSL)是获得蛋白质结构长程约束的重要工具。我们在这里研究了各种叠氮和炔轴承非规范氨基酸(ncAA)的蛋白质单,双掺入效率vianonsense抑制,代谢稳定性,氮氧化物labelingviacopper-catalyzed [3 + 2]叠氮-炔环加成(CuAAC)的产量,并在连续波和双电子-电子共振测量的光谱特性。我们确定对-乙炔基-L-苯丙氨酸和对-炔丙氧基-L-苯丙氨酸作为基于CuAAC的SDSL的合适ncAA,这将补充当前的SDSL方法,特别是在靶蛋白的必需半胱氨酸阻止使用巯基反应性自旋标记的情况下。
Electron paramagnetic resonance spectroscopy in combination with site-directed spin labeling (SDSL) is an important tool to obtain long-range distance restraints for protein structural research. We here study a variety of azide- and alkyne-bearing noncanonical amino acids (ncAA) in terms of protein single- and double-incorporation efficiencyvianonsense suppression, metabolic stability, yields of nitroxide labelingviacopper-catalyzed [3 + 2] azide–alkyne cycloadditions (CuAAC), and spectroscopic properties in continuous-wave and double electron–electron resonance measurements. We identifypara-ethynyl-l-phenylalanine andpara-propargyloxy-l-phenylalanine as suitable ncAA for CuAAC-based SDSL that will complement current SDSL approaches, particularly in cases in which essential cysteines of a target protein prevent the use of sulfhydryl-reactive spin labels.
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