Native Ambient Mass Spectrometry Enables Analysis of Intact Endogenous Protein Assemblies up to 145 kDa Directly from Tissue.

Native Ambient Mass Spectrometry Enables Analysis of Intact Endogenous Protein Assemblies up to 145 kDa Directly from Tissue.
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DOI:
10.1021/acs.analchem.1c05353
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发表时间:
2022-04-12
影响因子:
7.4
通讯作者:
Cooper, Helen J.
Cooper, Helen J.
中科院分区:
化学1区
文献类型:
--
作者:
Hale, Oliver J.;Hughes, James W.;Sisley, Emma K.;Cooper, Helen J.

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直接从其生理环境中以其功能形式对蛋白质进行非靶向无标记询问,有望通过提供前所未有的对它们与其他生物分子和外源性物质的瞬时相互作用的深入了解来改变生命科学研究。天然环境质谱(NAMS)显示出直接从组织中进行内源性蛋白质组装体的结构分析的巨大潜力;然而,迄今为止,这仅限于低分子量(<20 kDa)或非常高丰度(血管中的血红蛋白四聚体,肾皮质组织中的RidA同源三聚体)的组装体。目前的工作构成了一个步骤的变化NAMS的蛋白质组件:我们证明了检测和鉴定的范围内完整的内源性蛋白质组件与各种化学计量(二聚体,三聚体,四聚体)从一系列的组织类型(脑,肾,肝)通过使用多种NAMS技术。至关重要的是,我们证明了可接近的分子量(高达145 kDa)的两倍以上的增加。此外,高达94 kDa的蛋白质组装体的空间分布映射在脑和肾的纳米喷雾解吸电喷雾电离(纳米-DESI)质谱成像。
Untargeted label-free interrogation of proteins in their functional form directly from their physiological environment promises to transform life sciences research by providing unprecedented insight into their transient interactions with other biomolecules and xenobiotics. Native ambient mass spectrometry (NAMS) shows great potential for the structural analysis of endogenous protein assemblies directly from tissues; however, to date, this has been limited to assemblies of low molecular weight (<20 kDa) or very high abundance (hemoglobin tetramer in blood vessels, RidA homotrimer in kidney cortex tissues). The present work constitutes a step change for NAMS of protein assemblies: we demonstrate the detection and identification of a range of intact endogenous protein assemblies with various stoichiometries (dimer, trimer, and tetramer) from a range of tissue types (brain, kidney, liver) by the use of multiple NAMS techniques. Crucially, we demonstrate a greater than twofold increase in accessible molecular weight (up to 145 kDa). In addition, spatial distributions of protein assemblies up to 94 kDa were mapped in brain and kidney by nanospray desorption electrospray ionization (nano-DESI) mass spectrometry imaging.
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