首页> 外文期刊>Journal of Molecular Biology >Functional Studies of the 900 Tetraloop Capping Helix 27 of 16S Ribosomal RNA.
【24h】

Functional Studies of the 900 Tetraloop Capping Helix 27 of 16S Ribosomal RNA.

机译:16S核糖体RNA的900个Tetraloop封顶螺旋27的功能研究。

获取原文
获取原文并翻译 | 示例
           

摘要

The 900 tetraloop (positions 898-901) of Escherichia coli 16S rRNA caps helix 27, which is involved in a conformational switch crucial for the decoding function of the ribosome. This tetraloop forms a GNRA motif involved in intramolecular RNA-RNA interactions with its receptor in helix 24 of 16S rRNA. It is involved also in an intersubunit bridge, via an interaction with helix 67 in domain IV of 23S rRNA. Using a specialized ribosome system and an instant-evolution procedure, the four nucleotides of this loop were randomized and 15 functional mutants were selected in vivo. Positions 899 and 900, responsible for most of the tetraloop/receptor interactions, were found to be the most critical for ribosome activity. Functional studies showed that mutations in the 900 tetraloop impair subunit association and decrease translational fidelity. Computer modeling of the mutations allows correlation of the effect of mutations with perturbations of the tetraloop/receptor interactions.
机译:大肠杆菌16S rRNA的900个四环(898-901位)覆盖螺旋27,该螺旋与构象转换有关,对核糖体的解码功能至关重要。该四环形成参与分子内RNA-RNA与其16S rRNA的螺旋24中的受体相互作用的GNRA基序。它也通过与23S rRNA IV结构域中的螺旋67相互作用而参与亚基间桥。使用专门的核糖体系统和即时进化程序,将该环的四个核苷酸随机化,并在体内选择15个功能性突变体。发现负责大多数四环/受体相互作用的位置899和900对核糖体活性最关键。功能研究表明900四环中的突变会破坏亚基缔合并降低翻译保真度。突变的计算机模型允许突变的影响与四环/受体相互作用的扰动相关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号