Abstract
Interest in using DNA as a building block for nanoelectronic sensors and devices stems from its efficient hole-conducting properties and the relative ease with which it can be organized into predictable nanometre-sized two- and three-dimensional structures. However, because a hole migrates along DNA through the highest occupied molecular orbital of the guanine bases, its conductivity decreases as the adenine–thymine base-pair content increases. This means that there are limitations on what sequences can be used to construct functional nanoelectronic circuits, particularly those rich in adenine–thymine pairs. Here we show that the charge-transfer efficiency can be dramatically increased in a manner independent of guanine–cytosine content by adjusting the highest occupied molecular orbital level of the adenine–thymine base pair to be closer to that of the guanine–cytosine pair. This is achieved by substituting the N7 nitrogen atom of adenine with a C–H group to give 7-deazaadenine, which does not disturb the complementary base pairing observed in DNA.
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Acknowledgements
We thank K. Nakatani of SANKEN for the MALDI mass measurement. This work was partly supported by a Grant-in-Aid for Scientific Research (Project 17105005 and others) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government.
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K.K. and H.K. conceived and designed the experiments. H.K. performed the experiments. K.K., H.K. and T.M. analysed the data. H.K. and Y.O. contributed materials/analysis tools. K.K. and T.M. co-wrote the paper.
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Kawai, K., Kodera, H., Osakada, Y. et al. Sequence-independent and rapid long-range charge transfer through DNA. Nature Chem 1, 156–159 (2009). https://doi.org/10.1038/nchem.171
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DOI: https://doi.org/10.1038/nchem.171
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