结合flavin和尼古丁胺胺氧化还原共因子的RNA吸附体
1Department of Molecular Biology, Massachusetts General Hospital, Boston 02114, USA.
Journal of the American Chemical Society
|February 1, 1995
概括
研究人员开发了结合利博弗拉和尼古丁胺胺单核酸的RNA体. 这些RNA分子显示出创造参与氧化还原反应的新核酶的潜力,模仿代谢途径.
科学领域:
- 生物化学和分子生物学
- 合成生物学 合成生物学
- 在RNA Aptamer技术上
背景情况:
- рибофлавин (Rb) 和β-尼古丁胺胺 mononucleotide (NMN) 是许多代谢回氧反应中必不可少的辅助因子.
- 开发人工系统来模仿或控制这些反应是生物化学研究的一个关键领域.
- RNA体提供了一个多功能平台,用于分子识别和催化.
研究的目的:
- 为了分离和表征特定与利博弗拉和NMN结合的RNA吸附体.
- 调查这些体中辅因子结合和氧化还原特异性的结构基础.
- 探索这些体基因在开发新型 ribozymes 的潜力.
主要方法:
- 在体外选择 (SELEX) 来分离与Rb和NMN结合的RNA吸附体.
- DMS保护试验用于确定RNA二次结构和辅因子相互作用.
- 突变和重新选择以确定关键的结合区域并增强特异性.
- afinity测量 (Kd) 用于量化结合强度.
主要成果:
- 识别了具有G-四重奏基因的RNA体,与微分子亲和力结合氧化里博夫拉.
- 选择的RNA亚体,以超过一个数量级区分NAD和NADH.
- 描述了NMN结合性体的二级结构,揭示了复杂的干环相互作用.
- 发现了一种增强NMN结合特异性的特定突变.
结论:
- RNA可以以高亲和力结合Rb和NMN等必需的辅因子.
- RNA 体可以被设计为氧化还原状态的区分,特别是对于尼古丁胺胺辅因子.
- 这些发现为设计用于氧化还原催化物的新型 ribozyme 提供了基础.
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