期刊
ACS Applied Materials & Interfaces
卷 8, 期 29, 页码 18669-18674出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01883
关键词
electrochemical biosensor; stability and reusability; poly(ADP-ribose) polymerase; enzyme-initiated auto-PARylation; inhibitor
资金
- National Natural Science Foundation of China [31502033, 21505077, 21475062]
- China Postdoctoral Science Foundation [2015M581823]
- Fundamental Research Funds for the Central Universities [KJQN201615]
- Natural Science Foundation of Jiangsu Province [BK20130688]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
A stable and reusable electrochemical biosensor for the label-free detection of poly(ADP-ribose) polymerase (PARP) is designed in this work. C-kit-1, a thiol-modified G-quadruplex oligonucleotide, is first self-assembled on a gold electrode surface. The G-quadruplex structure of c-kit-1 can specifically tether and activate PARP, resulting in the generation of negatively charged poly(ADP-ribose) polymer (PAR). On the basis of electrostatic attraction, PAR facilitates the surface accumulation of positively charged electrochemical signal molecules. Through the characterization of electrochemical signal molecules, the label-free quantification of PARP is simply implemented. On the basis of the proposed method, selective quantification of PARP can be achieved over the linear range from 0.01 to 1 U with a calculated detection limit of 0.003U. Further studies also demonstrate the applicability of the proposed method to biosamples revealing the broad potential in practical applications. Furthermore, inhibitor of PARP has also been detected with this biosensor. Meanwhile, benefited from self-assembly on solid surface, this biosensor possesses two important features, i.e., reusability and stability, which are desirable in related biosensors.
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