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Juan Artes Vivancos2 1 Yuanhui Li1 Josh Hihath1

2, Chemistry, UMass Lowell, Lowell, Massachusetts, United States
1, ECE, UC Davis, Davis, California, United States

Energy transport is a critical process in biology, being crucial in respiration and photosynthesis.(1) Different biomolecules have evolved to be exquisitely tuned to transfer and transport energy (including excitons and charges) with astonishing efficiency. Recent literature shows multiple examples of this natural design in different biomolecules, including proteins and nucleic acids.(2) As a recent example, I will present recent results we obtained studying charge transport in nucleic acids, including DNA:RNA hybrid sequences from E. Coli.(3)

The continued discovery of new RNA modalities (non-coding, micro, enhancer, etc.) has resulted in an increased desire for detecting, sequencing, and identifying RNA segments for a variety of applications in food safety, water and environmental protection, plant and animal pathology, clinical diagnosis and research, and bio-security.

We have recently demonstrated that molecular conformation profoundly influences the conductance of nucleic acids(4) and that RNA can support long-range charge transport in specific sequences(5,6). We show that single-molecule conductance techniques can be used to extract biologically relevant information from short RNA oligonucleotides and that these measurements are sensitive to aM target concentrations, are capable of being multiplexed, and can detect targets of interest in the presence of other, possibly interfering RNA sequences.(3) We also demonstrate that the charge transport properties of RNA:DNA hybrids are sensitive to single-nucleotide polymorphisms, thus enabling differentiation between specific serotypes of Escherichia coli. Using a combination of spectroscopic and computational approaches, we determine that the conductance sensitivity primarily arises from changes the mutations have on the conformational structure of the molecules, rather than the direct chemical substitutions. This work is the first molecular conductance study of a biologically relevant sequence and opens new possibilities for developing electrically-based sensor and diagnostic platforms.

REFERENCES
1.R.A. Marcus, N. Sutin. Biochimica Et Biophysica Acta 811 (1985) 265–322.
2.J.M. Artes, J. Hihath, I. Díez-Pérez. Biomolecular electronics in Molecular Electronics: An Experimental and Theoretical Approach (ed. I. Baldea). 2016 Pan Stanford Publishing 281-323.
3.YH Li, JM Artes, B Demir, S Gokce, HM Mohammad, M. P. Anantram, E. E. Oren, J. Hihath. (2018) In revision
4.JM Artes, Y Li, J Qi, MP Anantram, J Hihath. Nature Communications 6 (2015), 8870.
5.Y Li, JM Artes, J Qi, IA Morelan, P Feldstein, MP Anantram, J Hihath. The Journal of Physical Chemistry Letters 7 (2016) 1888-1894.
6.Y Li, JM Artes, J Hihath. Small 12 (2016), 432-437.

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