Abstract
Protein p300 is a transcriptional co-activator that participates in many physiological processes including cell cycle control, differentiation and apoptosis. It serves (a) as a protein bridge that links specific transcription factors to the fundamental transcription machinery, (b) as a scaffold to complete multiple transcription cofactors, and (c) as an enzyme for acetylating histone and non-histone proteins. An ultrasensitive electrochemiluminescence (ECL) immunosensor is described here that is based on the use of a magnetic glassy carbon electrode modified with tetrahedral DNA with hollow structure, graphene oxide (GO) and gold nanocrystals. The use of a GO monolayer allows for greater carrying capacity and warrants a wider outer Helmholtz plane. Strong and stable ECL signals were achieved due to antigen-antibody interaction by using the ECL probe Ru(phen)32+. This immunosensor has a response that covers the 0.005 to 80 nM p300 concentration range and has a 1 pM detection limit. It was exploited for the determination of p300 in HeLa cell lysate and (spiked) serum.
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Acknowledgements
Financial support from the National Natural Science Foundation of China (21605089 and 81773483), the Ningbo Municipal Natural Science Foundation (2017A610228 and 2018A610217), the Open Subject of State Key Laboratory of Chemo/Biosensing and Chemometrics (2016001), and Zhejiang Provincial Natural Science Foundation of China (LY13B070013) are gratefully acknowledged. This work was also sponsored by K.C. Wong Magna Fund in Ningbo University.
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Hu, Y., Zhang, Q., Hu, D. et al. Ultrasensitive electrochemiluminescence immunosensor for the transcriptional co-activator p300 by using a graphene oxide monolayer and tetrahedral DNA-mediated signal amplification. Microchim Acta 186, 325 (2019). https://doi.org/10.1007/s00604-019-3435-4
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DOI: https://doi.org/10.1007/s00604-019-3435-4