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- W3011123093 abstract "Protein kinases are key regulators of cell function, the abnormal activity of which may induce several human diseases, including cancers. Therefore, it is of great significance to develop a sensitive and reliable method for assaying protein kinase activities in real biological samples. Here, we report the phosphorylation-dependent surface-enhanced Raman scattering (SERS) readout of spermine-functionalized silver nanoparticles (AgNPs) for protein kinase A (PKA) activity assay in cell extracts. In this assay, the presence of PKA would phosphorylate and alter the net charge states of Raman dye-labeled substrate peptides, and the resulting anionic products could absorb onto the AgNPs with cationic surface charge through electrostatic attraction. Meanwhile, the Raman signals of dyes labeled on peptides were strongly enhanced by the aggregated AgNPs with interparticle hot spots formed in assay buffer. The SERS readout was directly proportional to the PKA activity in a wide range of 0.0001–0.5 U·μL−1 with a detection limit as low as 0.00003 U·μL−1. Moreover, the proposed SERS-based assay for the PKA activity was successfully applied to monitoring the activity and inhibition of PKA in real biological samples, particularly in cell extracts, which would be beneficial for kinase-related disease diagnostics and inhibitor screening." @default.
- W3011123093 created "2020-03-23" @default.
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- W3011123093 date "2020-03-22" @default.
- W3011123093 modified "2023-10-12" @default.
- W3011123093 title "Phosphorylation-Dependent SERS Readout for Activity Assay of Protein Kinase A in Cell Extracts" @default.
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- W3011123093 doi "https://doi.org/10.3390/nano10030575" @default.
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