title: Switching of charge transport in DNA by regulated triplex formations at the dual sites.
abstract: A functionality of on/off switching to regulate conductivity should be among the prerequisites for the utilization of DNA duplex as a conducting material. We have reported that variation of temperatures can regulate the triplex formation and dissociation, thereby regulating charge transport in DNA. Based on this result, the on/off switching of conductivity at dual triplex forming sites in DNA was attempted, using two types of oligonucleotide (ODNs) with different strand lengths. Variation of temperatures produced DNA duplexes without any triplex site and with single and double triplex sites, by which the intramolecular charge transport in DNA duplex could be regulated at the respective triplex-forming sites. This may promote the utility of DNA duplex as a potential constituent of electronic nanodevices.
authors.affiliation: Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto University Katsura, Kyoto 615-8510, Japan.
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Haruna
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Tanabe
authors.forename: Haruka
authors.initials: H
authors.lastname: Iida
authors.forename: Sei-ichi
authors.initials: S
authors.lastname: Nishimoto
mesh_terms: D004247:DNA / Q000737:chemistry*; D004553:Electric Conductivity; D009841:Oligonucleotides / Q000737:chemistry / Q000528:radiation effects; D013696:Temperature
chemical_list: D009841:Oligonucleotides; C051802:triplex DNA; D004247:DNA