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Exciplexes and conical intersections lead to fluorescence quenching in ?-stacked dimers of 2-aminopurine with natural purine nucleobases.

ABSTRACT: Fluorescent analogues of the natural DNA bases are useful in the study of nucleic acids' structure and dynamics. 2-Aminopurine (2AP) is a widely used analogue with environmentally sensitive fluorescence behavior. The quantum yield of 2AP has been found to be significantly decreased when engaged in ?-stacking interactions with the native bases. We present a theoretical study on fluorescence quenching mechanisms in dimers of 2AP ?-stacked with adenine or guanine as in natural DNA. Relaxation pathways on the potential energy surfaces of the first excited states have been computed and reveal the importance of exciplexes and conical intersections in the fluorescence quenching process.

SUBMITTER: Liang J

PROVIDER: S-EPMC5006741 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature

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Exciplexes and conical intersections lead to fluorescence quenching in π-stacked dimers of 2-aminopurine with natural purine nucleobases.

Liang JingXin J Nguyen Quynh L QL Matsika Spiridoula S

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 20130801 8

Fluorescent analogues of the natural DNA bases are useful in the study of nucleic acids' structure and dynamics. 2-Aminopurine (2AP) is a widely used analogue with environmentally sensitive fluorescence behavior. The quantum yield of 2AP has been found to be significantly decreased when engaged in π-stacking interactions with the native bases. We present a theoretical study on fluorescence quenching mechanisms in dimers of 2AP π-stacked with adenine or guanine as in natural DNA. Relaxation pathw ...[more]

PMID: 23625036

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