核小体中损伤部位与核苷酸切除修复机制接触的差异。
Differences in the Access of Lesions to the Nucleotide Excision Repair Machinery in Nucleosomes.
作者信息
Cai Yuqin, Kropachev Konstantin, Terzidis Michael A, Masi Annalisa, Chatgilialoglu Chryssostomos, Shafirovich Vladimir, Geacintov Nicholas E, Broyde Suse
机构信息
§Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche, Bologna, 40129, Italy.
∥Institute of Nanoscience and Nanotechnology, National Center for Scientific Research Demokritos, 15341 Agia, Paraskevi, Athens, Greece.
出版信息
Biochemistry. 2015 Jul 14;54(27):4181-5. doi: 10.1021/acs.biochem.5b00564. Epub 2015 Jun 30.
Abstract
In nucleosomes, the access of DNA lesions to nucleotide excision repair is hindered by histone proteins. However, evidence that the nature of the DNA lesions may play a role in facilitating access is emerging, but these phenomena are not well-understood. We have used molecular dynamics simulations to elucidate the structural, dynamic, and energetic properties of the R and S 5'-8-cyclo-2'-dG and the (+)-cis-anti-B[a]P-dG lesions in a nucleosome. Our results show that the (+)-cis-anti-B[a]P-dG adduct is more dynamic and more destabilizing than the smaller and more constrained 5',8-cyclo-2'-dG lesions, suggesting more facile access to the more bulky (+)-cis-anti-B[a]P-dG lesion.
摘要
在核小体中，组蛋白会阻碍DNA损伤接受核苷酸切除修复。然而，有证据表明DNA损伤的性质可能在促进修复过程中发挥作用，但这些现象尚未得到充分理解。我们利用分子动力学模拟来阐明核小体中R型和S型5'-8-环-2'-脱氧鸟苷以及(+)-顺式-反式苯并[a]芘-脱氧鸟苷损伤的结构、动力学和能量特性。我们的结果表明，与较小且受限制较多的5',8-环-2'-脱氧鸟苷损伤相比，(+)-顺式-反式苯并[a]芘-脱氧鸟苷加合物更具动态性且更不稳定，这表明体积更大的(+)-顺式-反式苯并[a]芘-脱氧鸟苷损伤更容易被修复。
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