Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7230517 | Biosensors and Bioelectronics | 2016 | 6 Pages |
Abstract
A novel and sensitive surface-enhanced Raman scattering (SERS) method is proposed for the assay of DNA methyltransferase (MTase) activity and evaluation of inhibitors by developing a target triggering primer generation-based multiple signal amplification strategy. By using of a duplex substrate for Dam MTase, two hairpin templates and a Raman probe, multiple signal amplification mode is achieved. Once recognized by Dam MTase, the duplex substrate can be cleaved by Dpn I endonuclease and two primers are released for triggering the multiple signal amplification reaction. Consequently, a wide dynamic range and remarkably high sensitivity are obtained under isothermal conditions. The detection limit is 2.57Ã10â4Â UÂ mLâ1. This assay exhibits an excellent selectivity and is successfully applied in the screening of inhibitors for Dam MTase. In addition, this novel sensing system is potentially universal as the recognition element can be conveniently designed for other target analytes by changing the substrate of DNA MTase.
Related Topics
Physical Sciences and Engineering
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Analytical Chemistry
Authors
Ying Li, Chuanfeng Yu, Huixia Han, Caisheng Zhao, Xiaoru Zhang,