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Ab Initio Study of Guanine Damage by Hydroxyl Radical

机译:从头开始研究羟自由基对鸟嘌呤的伤害

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摘要

Multiconfigurational ab initio methods are used in this study to examine two initial reactions that take place during the OH radical attack of the DNA base guanine: a ring opening reaction and a hydrogen transfer reaction. The same reactions are also studied in the presence of a single water molecule. The ring opening reaction has a moderate barrier height of similar to 20-25 kcal/mol that is relatively insensitive to the presence of water. The barrier of the H-transfer reaction, on the other hand, is lowered from similar to 50 to similar to 22 kcal/mol when one water molecule is added, thus becoming comparable to the barrier height of the ring opening reaction.
机译:在这项研究中,使用了多种构型的从头算方法来研究DNA鸟嘌呤的OH自由基攻击期间发生的两个初始反应:开环反应和氢转移反应。在单个水分子的存在下也研究了相同的反应。开环反应具有适中的势垒高度,类似于20-25kcal / mol,其对水的存在相对不敏感。另一方面,当添加一个水分子时,H-转移反应的势垒从相似的50降低到相似的22kcal / mol,因此变得与开环反应的势垒高度相当。

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