Nucleic acid driven DNA machineries synthesizing Mg2+-dependent DNAzymes: an interplay between DNA sensing and logic-gate operations.

Abstract

Polymerase/nicking enzymes and nucleic-acid scaffolds are implemented as DNA machines for the development of amplified DNA-detection schemes, and for the design of logic gates. The analyte nucleic acid target acts, also, as input for the logic gates. In the presence of two DNA targets, acting as inputs, and appropriate DNA scaffolds, the polymerase-induced replication of the scaffolds, followed by the nicking of the replication products, are activated, leading to the autonomous synthesis of the Mg(2+)-dependent DNAzyme or the Mg(2+)-dependent DNAzyme subunits. These biocatalysts cleave a fluorophore/quencher-functionalized nucleic-acid substrate, thus providing fluorescence signals for the sensing events or outputs for the logic gates. The systems are used to develop OR, AND, and Controlled-AND gates, and the DNA-analyte targets represent two nucleic acid sequences of the smallpox viral genome.

• Authors: Ron Orbach, Lena Mostinski, Fuan Wang, Itamar Willner
• Journal: Chemistry (Weinheim an der Bergstrasse, Germany) (Chemistry) Vol. 18 Issue 46 Pg. 14689-94 (Nov 12 2012) ISSN: 1521-3765 [Electronic] Germany
• PMID: 23015539 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
• Copyright: Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chemical References

• DNA, Catalytic
• Nucleic Acids
• DNA
• Magnesium

Topics

• Base Sequence
• Computers, Molecular
• DNA (chemistry)
• DNA, Catalytic (chemistry)
• Magnesium (chemistry)
• Nucleic Acid Amplification Techniques
• Nucleic Acids (chemistry)