Shallow traps for thermally induced hole hopping in DNA

Bixon, M.; Jortner, Joshua

doi:10.1016/j.chemphys.2006.01.009

Cited by 22 publications

(22 citation statements)

References 54 publications

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“…Measurement of the absolute value of quantum efficiency of silver deposition uniquely determines g = 1.1. This value is indicative of direction-biased thermally induced hole hopping through (A) n and (AT) n/2 bridges to a GG final accepting site [39]. These results indicate that charge separation in this system occurs by sequential electron transfer in which the bridge is populated during hole transfer and forward electron transfer is more probable than backward electron transfer.…”

Section: Distance Dependence Of Charge Separation In Da-(at) N/2 -Gg mentioning

confidence: 77%

Photocatalytic probing of DNA sequence by using TiO2/dopamine-DNA triads

et al. 2007

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Section: Distance Dependence Of Charge Separation In Da-(at) N/2 -Gg mentioning

confidence: 77%

Photocatalytic probing of DNA sequence by using TiO2/dopamine-DNA triads

et al. 2007

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“…Over long distances, the mechanism is rather different [9]. In some sequences, the rate of charge transfer is observed to be essentially independent of the adenine:thymine (A:T) bridge length [9] and can be modeled as a localized charge's thermal activation onto the A:T bridge and incoherent hopping from 1 A to another [11]. In other cases [7,8], however, an exponential decrease in the rate of charge transfer is observed over long distances.…”

mentioning

confidence: 99%

“…Over short distances, the transport mechanism is coherent [9] and can be successfully viewed as a tunneling process [10,11] or interpreted classically as radical cation migration [12]. Over long distances, the mechanism is rather different [9].…”

mentioning

confidence: 99%

Solvent Effects on Charge Spatial Extent in DNA and Implications for Transfer

et al. 2007

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To clarify the role played by water in facilitating long-range DNA charge transport, carefully designed, state-of-the-art, self-interaction corrected density-functional quantum mechanical and molecular mechanical (SIC-QM/MM) simulations are performed for the first time on two ionized adenine:thymine bridge models in explicit water solvent at finite temperature. For random solvent configurations, the charge is partially delocalized. However, a charge localization on different, well-separated adenines can be induced and is correlated with a restructuring of their first solvation shells. Thus, the importance of water in the mechanism of long-range charge transport is explicitly demonstrated, and the microscopic conditions for a charge localization are revealed.

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“…In these respects, DNA electron transfer (ET) follows many studies of ET through proteins in solution, 31,32 twodimensional films at pure and modified electrode surfaces, 33−36 and at the single-molecule level of functional ET proteins. 35−38 As for protein ET, views on DNA conductivity rest on concepts from molecular ET science 39,40 such as superexchange, "vibrationally assisted tunnelling" or "hopping" between DNA base pairs, 41,42 and concepts of small and large polarons. 14,15 In comparison with proteins, DNA-based molecular electronic conductivity displays, however, differences which are only partly understood, notably:…”

Section: Introductionmentioning

confidence: 99%

Polycation Induced Potential Dependent Structural Transitions of Oligonucleotide Monolayers on Au(111)-Surfaces

et al. 2012

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ABSTRACT:We have studied self-assembled molecular monolayers (SAMs) of several 3′-C3-SH conjugated single-strand (ss) and double-strand (ds) 20-base oligonucleotides (ONs) immobilized on single-crystal, atomically planar Au(111)-electrode surfaces in the presence of the triply positively charged base spermidine (Spd). This cation binds strongly to the polyanionic ON backbone and stabilizes the ds-form relative to the ss-form. A combination of chemical ON synthesis, melting temperature measurements, cyclic voltammetry (CV), and in situ scanning tunneling microscopy (STM) in aqueous biological buffer under electrochemical potential control was used. Spd binding was found to increase notably the ds-ON melting temperature. CV displays capacitive features associated with ss-and ds-ON. A robust capacitive peak around −0.35 V versus saturated calomel electrode (SCE), specific to ds-ON and highly sensitive to base pair mismatches, was consistently observed. The peak is likely to be caused by surface structural reorganization around the peak potential and located close to reported peak potentials of several DNA intercalating or covalently tethered redox molecules reported as probes for long-range electron transfer.

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Shallow traps for thermally induced hole hopping in DNA

Cited by 22 publications

References 54 publications

Photocatalytic probing of DNA sequence by using TiO2/dopamine-DNA triads

Photocatalytic probing of DNA sequence by using TiO2/dopamine-DNA triads

Solvent Effects on Charge Spatial Extent in DNA and Implications for Transfer

Polycation Induced Potential Dependent Structural Transitions of Oligonucleotide Monolayers on Au(111)-Surfaces

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