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Antenna-based optical imaging of single Ca2+ transmembrane proteins in liquids

机译:液体中单个Ca2 +跨膜蛋白的基于天线的光学成像

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Understanding the diversity of biological processes requires methods that can address single proteins in their natural environment and provide insights into structural and functional properties, as well as the local distribution of each individual protein. We use an optical antenna in the form of a single gold nanoparticle to localize incident laser radiation to 50 nm, significantly smaller than the diffraction limit of light. Our approach enables us to optically resolve individual plasma-membrane-bound Ca2+ pumps. (PMCA4) immersed in aqueous environments and to determine the distribution of interprotein distances. We are able to correlate the protein maps with local topology. Improved antenna geometries will make it possible to resolve, identify, and probe single membrane proteins in live cells with true protein resolution of 5-10 nm.
机译:了解生物过程的多样性需要能够处理其自然环境中的单个蛋白质并提供有关结构和功能特性以及每个单个蛋白质的局部分布的见解的方法。我们使用单个金纳米粒子形式的光学天线将入射激光辐射定位到50 nm,这大大小于光的衍射极限。我们的方法使我们能够光学解析单个等离子膜结合的Ca2 +泵。 (PMCA4)浸入水性环境中,并确定蛋白间距离的分布。我们能够使蛋白质图谱与局部拓扑相关。改进的天线几何形状将使解析,鉴定和探测活细胞中的单膜蛋白质成为可能,其真实蛋白质分辨率为5-10 nm。

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