Protein Structure and Dynamics Studied by Mass Spectrometry

通过质谱研究蛋白质结构和动力学

• 批准号: 217080-2013
• 负责人: Konermann, Lars
• 金额: $ 7.21万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=570096
• 关键词: Protein; Structure; Dynamics; Studied; Mass

Most proteins in living organisms can perform their biological functions only after folding into a highly unique structure. Folding occurs spontaneously, driven by free energy gradients. Notably, the biologically active state remains quite dynamic, with structural fluctuations that are closely related to function. Misfolding can lead to Alzheimer's and many other diseases. Our group deciphers the mechanisms of protein folding and misfolding, as well as the interplay between structure, dynamics, and function. We have demonstrated international leadership in the development and application of novel protein mass spectrometry (MS) techniques. The current DG extends the reach and scope of these activities in a very significant way. (a) We will devise a method for elucidating the structures of the earliest folding intermediates. The combination of diffusive mixing with laser-induced oxidative labeling will improve the time resolution by three orders of magnitude compared to existing technologies. (b) We will employ oxidative labeling for mechanistic studies on a wide range of biologically important folding and self-assembly processes. (c) Hydrogen/deuterium exchange (HDX)/MS will be applied for gaining detailed insights into protein-ligand interactions. (d) Folding and dynamics of membrane proteins represent frontier areas that we will tackle using HDX/MS and oxidative labeling. (e) Shifting from traditional single-protein investigations to a "Systems Biology" perspective, we will be the first to apply structural/functional MS methods to protein networks, such as photosynthetic complexes. (f) Investigations on proteins in a solvent-free environment can reveal "intrinsic" biomolecular properties. Using a unique combination of gas-phase HDX, electron capture dissociation, ion mobility spectrometry, and computational modeling we will elucidate protein structures in the vacuum. Key to the success of all these activities is a carefully planned and executed strategy for HQP training. By becoming an integral part of our research enterprise HQP can develop an outstanding publication track record, as well as acquire the skills needed for successful careers in industry and academia.

生物体中的大多数蛋白质只有在折叠成高度独特的结构后才能发挥其生物学功能。折叠是在自由能梯度的驱动下自发发生的。值得注意的是，生物活性状态仍然相当动态，结构波动与功能密切相关。错误折叠会导致阿尔茨海默氏症和许多其他疾病。我们的团队破译蛋白质折叠和错误折叠的机制，以及结构，动力学和功能之间的相互作用。我们在新型蛋白质质谱（MS）技术的开发和应用方面具有国际领先地位。目前的总干事以非常重要的方式扩大了这些活动的范围。(a)我们将设计一种方法来阐明最早的折叠中间体的结构。与现有技术相比，扩散混合与激光诱导氧化标记的组合将使时间分辨率提高三个数量级。(b)我们将采用氧化标记的机械研究的生物学重要的折叠和自组装过程的范围广泛。(c)氢/氘交换（HDX）/MS将用于获得蛋白质-配体相互作用的详细见解。(d)膜蛋白的折叠和动力学代表了我们将使用HDX/MS和氧化标记来解决的前沿领域。(e)从传统的单蛋白质研究转向“系统生物学”的角度，我们将是第一个将结构/功能MS方法应用于蛋白质网络，如光合复合物。(f)在无溶剂环境中对蛋白质的研究可以揭示“内在”生物分子特性。使用气相HDX、电子捕获解离、离子迁移谱和计算建模的独特组合，我们将阐明真空中的蛋白质结构。所有这些活动成功的关键是HQP培训的精心计划和执行策略。通过成为我们研究企业的一个组成部分，HQP可以开发一个出色的出版记录，以及获得在工业和学术界成功的职业生涯所需的技能。