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Identification of Individual Target Molecules Using Antibody-Decorated DeepTipTM Atomic-Force Microscopy Probes

分子 力谱学 生物素化 生物分子 原子力显微镜 化学 链霉亲和素 非接触原子力显微镜 共价键 分子动力学 生物物理学 纳米技术 结晶学 材料科学 开尔文探针力显微镜 生物素 生物化学 计算化学 生物 有机化学
作者
Daniel Corregidor-Ortiz,Rafael Daza,Luis Colchero,Raquel Tabraue-Rubio,J. M. Atienza,M. Elices,Gustavo V. Guinea,José Pérez‐Rigueiro
出处
期刊:Biomimetics [Multidisciplinary Digital Publishing Institute]
卷期号:9 (4): 192-192
标识
DOI:10.3390/biomimetics9040192
摘要

A versatile and robust procedure is developed that allows the identification of individual target molecules using antibodies bound to a DeepTipTM functionalized atomic-force microscopy probe. The model system used for the validation of this process consists of a biotinylated anti-lactate dehydrogenase antibody immobilized on a streptavidin-decorated AFM probe. Lactate dehydrogenase (LDH) is employed as target molecule and covalently immobilized on functionalized MicroDeckTM substrates. The interaction between sensor and target molecules is explored by recording force–displacement (F–z) curves with an atomic-force microscope. F–z curves that correspond to the genuine sensor–target molecule interaction are identified based on the following three criteria: (i) number of peaks, (ii) value of the adhesion force, and (iii) presence or absence of the elastomeric trait. The application of these criteria leads to establishing seven groups, ranging from no interaction to multiple sensor–target molecule interactions, for which force–displacement curves are classified. The possibility of recording consistently single-molecule interaction events between an antibody and its specific antigen, in combination with the high proportion of successful interaction events obtained, increases remarkably the possibilities offered by affinity atomic-force microscopy for the characterization of biological and biomimetic systems from the molecular to the tissue scales.
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