Real‐Time Monitoring of Phosphorylation Kinetics with Self‐Assembled Nano‐oscillators |
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Authors: | Yimin Fang Shan Chen Prof Wei Wang Xiaonan Shan Prof Nongjian Tao |
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Institution: | 1. State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (China);2. Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University, Tempe, AZ 85287 (USA) |
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Abstract: | Phosphorylation is a post‐translational modification that is involved in many basic cellular processes and diseases, but is difficult to detect in real time with existing technologies. A label‐free detection of phosphorylation is reported in real time with self‐assembled nano‐oscillators. Each nano‐oscillator consists of a gold nanoparticle tethered to a gold surface with a molecular linker. When the nanoparticle is charged, the nano‐oscillator can be driven into oscillation with an electric field and detected with a plasmonic imaging approach. The nano‐oscillators measure charge change associated with phosphorylation of peptides attached onto a single nanoparticle, allowing us to study the dynamic process of phosphorylation in real time without antibodies down to a few molecules, from which Michaelis and catalytic rate constants are determined. |
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Keywords: | charge‐based detection nano‐oscillators phosphorylation plasmonic imaging real‐time imaging |
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