核酸周围的酸性结构域。
Acidic domains around nucleic acids.
作者信息
Lamm G, Pack G R
机构信息
Department of Biomedical Sciences, University of Illinois College of Medicine, Rockford 61107.
出版信息
Proc Natl Acad Sci U S A. 1990 Nov;87(22):9033-6. doi: 10.1073/pnas.87.22.9033.
Abstract
The hydrogen ion concentration in the vicinity of DNA was mapped out within the Poisson-Boltzmann approximation. Experimental conditions were modeled by assuming Na-DNA to be solvated in a buffer solution containing 45 mM Tris and 3 mM Mg cations at pH 7.5. Three regions of high H+ concentration (greater than 10 microM) are predicted: one throughout the minor groove of DNA and two localized in the major groove near N7 of guanine and C5 of cytosine for a G.C base pair. These acidic domains correlate well with the observed covalent binding sites of benzo[a]pyrene epoxide (N2 of guanine) and of aflatoxin B1 epoxide (N7 of guanine), chemical carcinogens that presumably undergo acid catalysis to form highly reactive carbocations that ultimately bind to DNA. It is suggested that these regions of high H+ concentration may also be of concern in understanding interactions involving proteins and noncarcinogenic molecules with or near nucleic acids.
摘要
在泊松-玻尔兹曼近似范围内绘制了DNA附近的氢离子浓度图。通过假设Na-DNA在pH值为7.5、含有45 mM Tris和3 mM Mg阳离子的缓冲溶液中溶剂化来模拟实验条件。预测出三个高H⁺浓度区域（大于10 μM）：一个贯穿DNA的小沟，另外两个位于鸟嘌呤N7和胞嘧啶C5附近的大沟中，对应一个G.C碱基对。这些酸性区域与苯并[a]芘环氧化物（鸟嘌呤的N2）和平曲霉素B1环氧化物（鸟嘌呤的N7）的观察到的共价结合位点密切相关，这些化学致癌物可能经历酸催化形成高反应性碳正离子，最终与DNA结合。有人提出，这些高H⁺浓度区域在理解涉及蛋白质和非致癌分子与核酸或其附近的相互作用时也可能值得关注。
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