Issue 2, 2016

Detection of DNA methyltransferase activity using allosteric molecular beacons

Abstract

Abnormal DNA methylation patterns caused by altered DNA methyltransferase (MTase) activity are closely associated with cancer. Herein, using DNA adenine methylation methyltransferase (Dam MTase) as a model analyte, we designed an allosteric molecular beacon (aMB) for sensitive detection of Dam MTase activity. When the specific site in an aMB is methylated by Dam MTase, the probe can be cut by the restriction nuclease DpnI to release a fluorophore labeled aptamer specific for streptavidin (SA) which will bind to SA beads to generate highly fluorescent beads for easy signal readout by a microscope or flow cytometer. However, aMBs maintain a hairpin structure without the binding ability to SA beads in the absence of Dam MTase, leading to weakly fluorescent SA beads. Unlike the existing signal amplified assays, our method is simpler and more convenient. The high performance of the aptamer and the easy bead separation process make this probe superior to other methods for the detection of MTase in complex biological systems. Overall, the proposed method with a detection limit of 0.57 U mL−1 for Dam MTase shows great potential for further applications in the detection of other MTases, screening of MTase inhibitors, and early diagnosis of cancer.

Graphical abstract: Detection of DNA methyltransferase activity using allosteric molecular beacons

Article information

Article type
Paper
Submitted
28 ⵖⵓⵛ 2015
Accepted
04 ⴽⵜⵓ 2015
First published
05 ⴽⵜⵓ 2015

Analyst, 2016,141, 579-584

Author version available

Detection of DNA methyltransferase activity using allosteric molecular beacons

W. Zhang, X. Zu, Y. Song, Z. Zhu and C. J. Yang, Analyst, 2016, 141, 579 DOI: 10.1039/C5AN01763G

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