Reversible energy-transfer switching on a DNA scaffold.

Reversible energy-transfer switching on a DNA scaffold.
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DOI:
10.1021/ja512416n
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发表时间:
2015-02-25
影响因子:
15
通讯作者:
Andreasson, Joakim
Andreasson, Joakim
中科院分区:
化学1区
文献类型:
--
作者:
Baelter, Magnus;Harnmarson, Martin;Remon, Patricia;Li, Shiming;Gale, Nittaya;Brown, Tom;Andreasson, Joakim

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我们发现,太平洋蓝(PB)和共价连接在DNA支架上的Alexa488(A488)之间的FRET可以通过螺吡喃衍生物的光致变色开关进行可逆控制。由于螺吡喃以闭合螺环异构体的形式存在,FRET在PB和A488之间自由发生。紫外光诱导异构化为开放的花菁,通过有效地猝灭PB激发态,关闭了FRET过程。这个过程通过暴露在可见光下被逆转,触发螺环异构体的异构化。
We show that FRET between Pacific Blue (PB) and Alexa488 (A488) covalently attached to a DNA scaffold can be reversibly controlled by photochromic switching of a spiropyran derivative. With the spiropyran in the closed spiro isomeric form, FRET occurs freely between PB and A488. UV-induced isomerization to the open merocyanine form shuts down the FRET process by efficient quenching of the PB excited state. The process is reversed by exposure to visible light, triggering the isomerization to the spiro isomer.
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