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在聚合物中战略位置的Arg/Lys残留物促进了核酸生物合成过程中的正确合
Vito Genna1,2, Paolo Carloni2, Marco De Vivo1,2
1Laboratory of Molecular Modeling and Drug Discovery , Istituto Italiano di Tecnologia , Via Morego 30 , 16163 Genoa , Italy.
Journal of the American Chemical Society
|February 10, 2018
概括
在聚合酶 (Pols) 中保存的正电荷残留物对于稳定DNA和RNA合成期间的沃森-克里克基配对至关重要. 这一发现有助于酶工程和药物发现调节Pols功能.
科学领域:
- 生物化学
- 分子生物学
- 结构生物学
背景情况:
- 聚合酶 (Pols) 合成细胞功能必需的核酸.
- 在这个过程中确保沃森-克里克 (W-C) 基配对的精确分子机制仍然不完全理解.
研究的目的:
- 在聚合酶介导的核酸生物合成过程中阐明沃森-克里克基配对忠实性的分子基础.
- 确定参与稳定核酸结合的关键残留物.
主要方法:
- 对大量聚合酶/DNA结构的生物信息学分析.
- 量子和经典的模拟.
- 使用人类DNA聚合酶-eta (Pol-η) 作为模型进行自由能量计算.
主要成果:
- 在聚合酶活性部位附近发现了一种保存的正电荷残留物 (lysine或arginine),与传入的核酸相互作用.
- 这种残留物的存在与沃森-克里克基配对相关,而它的突变或缺失与替代的胡格斯基配对有关.
- 计算模拟表明,在人类的Pol-η中,Arginine 61积极促进了W-C基配对.
结论:
- 一种特定的正电荷残留物在稳定输入的核酸和确保核酸合成期间的沃森-克里克结中起着至关重要的作用.
- 这些发现为理解聚合酶忠实性提供了结构框架.
- 这些结果对酶工程和向聚合酶活性药物的开发有影响.
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