期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 656, 期 1-2, 页码 274-278出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2010.10.012
关键词
Electroanalysis; Phosphorylation; Kinase; Gold nanoparticles
资金
- National Science Fund for Distinguished Young Scholars [20925520]
- Shanghai Science and Technology Committee [09DZ2271800]
In this paper, we report an electrochemical strategy for the detection of phosphorylation based on enzyme-linked electrocatalysis. In this strategy, the substrate peptides modified on a gold electrode surface are firstly phosphorylated by protein kinase, and then biotinylated via the recognition and combination with the specific biotin-labeled antibody. After that, gold nanoparticles (Au-NPs) which are modified with horseradish peroxidase (HRP) loaded streptavidin are immobilized on the surface of the electrode through biotin-avidin interaction. As a result, HRP on the electrode surface may take catalytic reaction towards the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB), and the generated electrochemical signals can be used to monitor phosphorylation. This proposed electrochemical strategy can be employed to detect kinase activity with a satisfactory detection limit of 1 x 10(-3) unit/mL and linear range from 1 x 10(-3) to 1 x 10(-2) unit/mL. Furthermore, the inhibition of protein kinase has been also studied by using this strategy. (C) 2010 Elsevier B.V. All rights reserved.
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