Photoswitchable formation of a DNA interstrand cross-link by a coumarin-modified nucleotide.

Photoswitchable formation of a DNA interstrand cross-link by a coumarin-modified nucleotide.
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DOI:
10.1002/anie.201310609
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发表时间:
2014-07-01
影响因子:
16.6
通讯作者:
Peng, Xiaohua
Peng, Xiaohua
中科院分区:
化学1区
文献类型:
--
作者:
Haque, Mohammad Mojibul;Sun, Huabing;Liu, Shuo;Wang, Yinsheng;Peng, Xiaohua

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A coumarin-modified pyrimidine nucleoside (1) has been synthesized using Cu(I)-catalyzed click reaction and incorporated into oligodeoxynucleotides (ODNs). Interstrand cross-links are produced upon irradiation of ODN containing 1 at 350 nm. Cross-linking occurs via [2+2] cycloaddition reaction with the opposing thymidine, 2′-deoxycytidine, or 2′-deoxyadenosine. A much higher reactivity was observed with dT than dC or dA. Irradiation of the dT-1 and dC-1 cross-linked products at 254 nm leads to a reversible ring-opening reaction, while such phenomenon was not observed with dA-1 adducts. The reversible reaction is ultrafast and complete within 50 s – 90 s. Consistent photoswitching behavior was observed over 6 cycles of irradiation at 350 nm and 254 nm. To the best of our knowledge, this is the first example of photoswitchable interstrand cross-linking formation induced by a modified pyrimidine nucleoside. Compound 1 is a novel tool for developing reversible DNA photoswitches which will lead to new applications in chemistry, biology, and nanotechnology.
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