Photosensitized [2 + 2] cycloaddition of N-acetylated cytosine affords stereoselective formation of cyclobutane pyrimidine dimer.
Photosensitized [2 + 2] cycloaddition of N-acetylated cytosine affords stereoselective formation of cyclobutane pyrimidine dimer.
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DOI:
10.1093/nar/gkq855
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发表时间:
2011-02
影响因子:
14.9
通讯作者:
Iwai S
中科院分区:
文献类型:
--
作者:
Yamamoto J;Nishiguchi K;Manabe K;Masutani C;Hanaoka F;Iwai S
Photocycloaddition between two adjacent bases in DNA produces a cyclobutane pyrimidine dimer (CPD), which is one of the major UV-induced DNA lesions, with either the cis-syn or trans-syn structure. In this study, we investigated the photosensitized intramolecular cycloaddition of partially-protected thymidylyl-(3′→5′)-N4-acetyl-2′-deoxy-5-methylcytidine, to clarify the effect of the base modification on the cycloaddition reaction. The reaction resulted in the stereoselective formation of the trans-syn CPD, followed by hydrolysis of the acetylamino group. The same result was obtained for the photocycloaddition of thymidylyl-(3′→5′)-N4-acetyl-2′-deoxycytidine, whereas both the cis-syn and trans-syn CPDs were formed from thymidylyl-(3′→5′)-thymidine. Kinetic analyses revealed that the activation energy of the acid-catalyzed hydrolysis is comparable to that reported for the thymine-cytosine CPD. These findings provided a new strategy for the synthesis of oligonucleotides containing the trans-syn CPD. Using the synthesized oligonucleotide, translesion synthesis by human DNA polymerase η was analyzed.
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DOI:
10.1016/s1011-1344(00)00009-9
发表时间:
2000-02-01
影响因子:
5.4
作者:
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通讯作者:
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影响因子:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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