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In the current study, a novel electrochemiluminescence biosensor based on the entropy-driven DNA tetrahedron for the detection of matrix metalloproteinase 2 (MMP2), an enzyme that regulates extracellular matrix remodeling and affects aging was reported. The biosensor utilizes an inverted DNA tetrahedron structure, which exposes three vertices to the solution, as molecular recognition units for capturing specific biomolecules. The biosensor also employs a ratiometric method and an entropy-driven reaction, which enhance the response rate and sensitivity of the detection. The biosensor can detect MMP2 with a detection limit of 55.2 fM, which is lower than that of conventional sensors. The biosensor also exhibits excellent stability and reproducibility, and can accurately measure MMP2 levels in complex samples, such as human serum. The paper demonstrates the feasibility and effectiveness of using the "inverted" DNA tetrahedron structure and the entropy-driven process to construct interfacial biosensors. The paper also discusses the potential applications of the biosensor in clinical diagnosis and anti-aging research, where MMP2 plays a crucial role in tissue damage and repair. The paper provides a valuable contribution to the field of biosensor development, and opens up new possibilities for using DNA nanotechnology for sensitive and reliable detection of various biomolecules. Copyright © 2023 Elsevier B.V. All rights reserved.


Jihua Wei, Zichun Song, Jiuying Cui, Yuanxun Gong, Qianli Tang, Kai Zhang, Xinlei Song, Xianjiu Liao. Inverting the DNA tetrahedron: A novel strategy for sensitive and stable detection of aging-related enzyme MMP2. Analytica chimica acta. 2023 Oct 16;1278:341736

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PMID: 37709470

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