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Zhao P, Zhou L, Nie Z, Xu X, Li W, Huang Y, He K, Yao S. Versatile electrochemiluminescent biosensor for protein-nucleic acid interaction based on the unique quenching effect of deoxyguanosine-5'-phosphate on electrochemiluminescence of CdTe/ZnS quantum dots. Anal Chem 2013; 85:6279-86. [PMID: 23742234 DOI: 10.1021/ac4004437] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this paper, the efficient quenching effect of deoxyguanosine-5'-phosphate (dGMP) on anodic electrochemiluminescence (ECL) of the CdTe/ZnS quantum dots (QDs) is reported for the first time. This ECL quenching was found to be specific for free dGMP and not observed for dGMP residues in different DNA structures. The unique dGMP-based QDs ECL quenching was then utilized to develop a versatile biosensing strategy to determine various protein-DNA interactions with the assistance of exonuclease, Exo I, to hydrolyze DNA and liberate dGMP. Taking single-stranded DNA binding protein (SSB) and thrombin as examples, two novel detection modes have been developed based on dGMP-QDs ECL strategy. The first method used hairpin probes and SSB-promoted probe cleavage by Exo I for facile signal-off detection of SSB, with a wide linear range of 1-200 nM and a low detection limit of 0.1 nM. The second method exploited aptamer-thrombin binding to protect probes against Exo I degradation for sensitive signal-on detection of thrombin, giving a linear response over a range of 1-150 nM and a detection limit as low as 0.1 nM. Both methods were homogeneous and label-free without QDs or DNA modification. Therefore, this dGMP-specific QDs ECL quenching presents a promising detection mechanism suitable for probing various protein-nucleic acid interactions.
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Affiliation(s)
- Peng Zhao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China
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Dennany L, Wallace GG, Forster RJ. Luminescent metal complexes within polyelectrolyte layers: tuning electron and energy transfer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:14053-14060. [PMID: 19601581 DOI: 10.1021/la901661v] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The electrochemical and photophysical properties of a luminescent metal center, [Os(bpy)(3)](2+), are significantly modified by encapsulation within a conducting polymer composite film. Cyclic voltammetry reveals that the encapsulation in an inherently conducting polymer, polyaniline (Pani) or polypyrrole (PPy), can dramatically influence the charge-transfer rates between the metal centers. The increased electron transport, most likely mediated through the conducting polymer backbone, significantly enhances the electrochemiluminescence (ECL) efficiency. The increased communication between adjacent metal centers can also result in other interesting properties, such as photoinduced electron-transfer processes. In situ electron spin resonance (ESR) spectroscopy has been used to probe the photo-oxidation of an osmium metal center encapsulated in a PPy composite film. The irradiation of PPy in the presence of the osmium metal center resulted in the photo-oxidation of the Os(2+) to Os(3+) state and the consequent reduction of the PPy polyelectrolyte. The degree of communication between luminescent metal centers allows the composite properties to be tuned for various applications including ECL sensor devices and light-switching and light-harvesting systems.
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Affiliation(s)
- Lynn Dennany
- Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus, University of Wollongong, Fairy Meadow, NSW 2519, Australia.
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Wang P, Miller JE, Henling LM, Stern CL, Frank NL, Eckermann AL, Meade TJ. Synthesis and Characterization of Ruthenium and Rhenium Nucleosides. Inorg Chem 2007; 46:9853-62. [DOI: 10.1021/ic701250r] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peijiao Wang
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
| | - Jeremiah E. Miller
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
| | - Lawrence M. Henling
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
| | - Charlotte L. Stern
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
| | - Natia L. Frank
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
| | - Amanda L. Eckermann
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
| | - Thomas J. Meade
- Departments of Chemistry, Biochemistry and Molecular and Cell Biology, Neurobiology and Physiology and Radiology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, University of Washington, School of Law, William H. Gates Hall, Box 353020 Seattle, Washington 98195, Beckman Institute, California Institute of Technology, Pasadena, California 91125, and Department of Chemistry, P.O. Box 3065, STN CSC, University of Victoria, Victoria, BC, V8W 3V6, Canada
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