Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 12, Pages 4015-4021Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504797
Keywords
affinity; DNA; flanking sequences; G-quadruplexes; hemin
Categories
Funding
- Fundamental Research Funds for the Universities of Henan Province [NSFRF140150]
- SAMP
- T Research Projects of Education Department of Henan Province, China [13A180328]
- NSF of China [21375135, 21321003, 21575147]
- Beijing National Laboratory for Molecular Sciences, China
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G-quadruplex (G4)/hemin DNAzymes have been extensively applied in bioanalysis and molecular devices. However, their catalytic activity is still much lower than that of proteinous enzymes. The G4/hemin DNAzyme activity is correlated with the G4 conformations and the solution conditions. However, little is known about the effect of the flanking sequences on the activity, though they are important parts of G4s. Here, we report sequences containing d(CCC), flanked on both ends of the G4-core sequences remarkably enhance their DNAzyme activity. By using circular dichroism and UV-visible spectroscopy, the d(CCC) flanking sequences were demonstrated to improve the hemin binding affinity to G4s instead of increasing the parallel G4 formation, which might explain the enhanced DNAzyme activity. Meanwhile, the increased hemin binding ability promoted the degradation of hemin within the DNAzyme by H2O2. Furthermore, the DNAzyme with d(CCC) flanking sequences showed strong tolerance to pH value changes, which makes it more suitable for applications requiring wide pH conditions. The results highlight the influence of the flanking sequences on the DNAzyme activity and provide insightful information for the design of highly active DNAzymes.
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