一个结构化的D-RNA分子被一个L-RNA胺体所结合
Jonathan T Sczepanski1, Gerald F Joyce
1Departments of Chemistry and Molecular Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States.
Journal of the American Chemical Society
|August 28, 2013
概括
研究人员开发了一种新型L-RNA吸收体,该吸收体与HIV-1转激活响应 (TAR) RNA的D形式结合. 这种结合抑制了一个关键复合体,这表明L-aptamers是结构RNA的潜在治疗方法.
科学领域:
- * 分子生物学 * 分子生物学
- * 核酸化学的核酸化学
- * 病毒学 病毒学
背景情况:
- *HIV-1依赖转激活响应 (TAR) RNA元素进行复制.
- * Tat-TAR 相互作用对 TAR RNA 功能和病毒复制至关重要.
- * 亚胺是短核酸序列,可以以高亲和度和特异性结合目标.
研究的目的:
- * 开发一种能够结合HIV-1 TAR RNA的自然D形式的L-RNA胺体.
- * 为了研究L-aptamer与D-TAR RNA的结合方式和亲和力.
- * 评估L-胺酶作为对结构RNA的治疗剂的潜力.
主要方法:
- * 采用体外选择方法,获得D-阿巴对抗L-TAR RNA的D-阿巴.
- * 用化学合成制造相应的L-胺.
- *使用生物物理方法确定结合亲和力 (Kd) 和相互作用部位.
- *评估了Tat-TAR复合体形成的抑制.
主要成果:
- *合成了一种L-aptamer,该L-aptamer与D-TARRNA结合,其解离常数 (Kd) 为100nM.
- *L-胺酶仅与D-TAR RNA的六核酸远端环结合.
- * 结合是通过三级相互作用发生的,而不是沃森-克里克配对,这代表了相反的基拉性核酸之间的新型结合模式.
- *L-胺酶结合抑制了必需的Tat-TAR核糖蛋白复合物的形成.
结论:
- *这项研究证明了L-和D-核酸之间的特异性三级相互作用的第一个例子.
- * 向D-TARRNA的L-阿巴坦可以抑制HIV-1复制中的关键步骤.
- * 由于L-亚胺对核糖核酶具有耐药性,因此为治疗针对结构化RNA的抗意义寡核酸提供了一个有希望的替代品.
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