Rational design of DNA-actuated enzyme nanoreactors guided by single molecule analysis

Soma Dhakal, Matthew R. Adendorff, Minghui Liu, Hao Yan, Mark Bathe, Nils G. Walter

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The control of enzymatic reactions using nanoscale DNA devices offers a powerful application of DNA nanotechnology uniquely derived from actuation. However, previous characterization of enzymatic reaction rates using bulk biochemical assays reported suboptimal function of DNA devices such as tweezers. To gain mechanistic insight into this deficiency and to identify design rules to improve their function, here we exploit the synergy of single molecule imaging and computational modeling to characterize the three-dimensional structures and catalytic functions of DNA tweezer-actuated nanoreactors. Our analysis revealed two important deficiencies-incomplete closure upon actuation and conformational heterogeneity. Upon rational redesign of the Holliday junctions located at their hinge and arms, we found that the DNA tweezers could be more completely and uniformly closed. A novel single molecule enzyme assay was developed to demonstrate that our design improvements yield significant, independent enhancements in the fraction of active enzyme nanoreactors and their individual substrate turnover frequencies. The sequence-level design strategies explored here may aid more broadly in improving the performance of DNA-based nanodevices including biological and chemical sensors.

Original languageEnglish
Pages (from-to)3125-3137
Number of pages13
JournalNanoscale
Volume8
Issue number5
DOIs
Publication statusPublished - Feb 7 2016

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Nanoreactors
DNA
Enzymes
Molecules
Assays
Hinges
Chemical sensors
Nanotechnology
Reaction rates
Imaging techniques
Substrates

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Dhakal, S., Adendorff, M. R., Liu, M., Yan, H., Bathe, M., & Walter, N. G. (2016). Rational design of DNA-actuated enzyme nanoreactors guided by single molecule analysis. Nanoscale, 8(5), 3125-3137. https://doi.org/10.1039/c5nr07263h

Rational design of DNA-actuated enzyme nanoreactors guided by single molecule analysis. / Dhakal, Soma; Adendorff, Matthew R.; Liu, Minghui; Yan, Hao; Bathe, Mark; Walter, Nils G.

In: Nanoscale, Vol. 8, No. 5, 07.02.2016, p. 3125-3137.

Research output: Contribution to journalArticle

Dhakal, S, Adendorff, MR, Liu, M, Yan, H, Bathe, M & Walter, NG 2016, 'Rational design of DNA-actuated enzyme nanoreactors guided by single molecule analysis', Nanoscale, vol. 8, no. 5, pp. 3125-3137. https://doi.org/10.1039/c5nr07263h
Dhakal, Soma ; Adendorff, Matthew R. ; Liu, Minghui ; Yan, Hao ; Bathe, Mark ; Walter, Nils G. / Rational design of DNA-actuated enzyme nanoreactors guided by single molecule analysis. In: Nanoscale. 2016 ; Vol. 8, No. 5. pp. 3125-3137.
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