The reductive electron transfer (ET) in DNA can be studied by ultrafast time-resolved measurements combined with chemically probed DNAstrand-cleavage experiments. Owing to the numerous conformations of DNA present the results show a variety of ET rates. For more information see the Communication by H.-A. Wagenknecht, T. Fiebig, et al. on the following pages.
Five times is more than fivefold: The helical π‐stacked array of pyrene‐modified uridine shows a strong fluorescence enhancement that is structure sensitive to base mismatches. As the fluorescence is highly sequence dependent, it can serve as a structure‐sensitive probe for DNA.
DNA ist ein flexibles Medium mit vielfältigen konformativen Zuständen. Dies hat zur Folge, dass bei der Untersuchung des DNA‐vermittelten reduktiven Elektronentransfers unter Verwendung von 5‐Brom‐2′‐desoxyuridin als Elektronenacceptor (rot im Bild) und Pyren‐1‐yl‐2′‐desoxyuridin als Elektronendonor (blau) nicht einzelne Geschwindigkeitskonstanten beobachtet werden; vielmehr wird eine Verteilung von Geschwindigkeiten erhalten.
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