Major groove binding of the tRNA/mRNA complex to the 16 S ribosomal RNA decoding site.

Major groove binding of the tRNA/mRNA complex to the 16 S ribosomal RNA decoding site.
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tRNA/mRNA 复合物与 16S 核糖体 RNA 解码位点的大沟结合。

DOI:
10.1006/jmbi.1998.2442
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发表时间:
1999
期刊:
Journal of molecular biology.
影响因子:
--
通讯作者:
Harvey,SC
Harvey,SC
中科院分区:
--
文献类型:
--
作者:
VanLoock,MS;Easterwood,TR;Harvey,SC

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我们提出了一个详细的三维模型,具有原子细节,用于大肠杆菌16 S rRNA解码位点与mRNA以及A和P位点tRNA的复合体的结构。模型的建立首先基于四个基本假设:(1)A和P位点tRNA的构象与tRNA晶体结构中的构象相同;(2)A和P位点tRNA在与核糖体中的mRNA结合时采用S型取向;(3)A1492和A1493通过一系列氢键与mRNA非特异性结合;和(4)C1400位于P-位点tRNA摆动碱基附近,以满足在两个残基之间形成的UV-诱导的光交联。我们有模型与大沟和小沟结合的tRNA/mRNA复合物的解码位点RNA,并得出结论,大沟结合更有可能。这两类模型保持与结合巴龙霉素的解码位点RNA的A-位点区域的NMR结构中报告的结构特征。我们还提出了模型的tRNA/mRNA复合物结合的解码位点RNA的存在下,氨基糖苷巴龙霉素。我们讨论了可能的机制,核糖体的证明阅读和抗生素破坏这种证明阅读。
We propose a detailed three-dimensional model, with atomic detail, for the structure of the Escherichia coli 16 S rRNA decoding site in a complex with mRNA and the A and P-site tRNAs. Model building began with four primary assumptions: (1) A and P-site tRNA conformations are identical with those seen in the tRNA crystal structure; (2) A and P-site tRNAs adopt an S-type orientation upon binding mRNA in the ribosome; (3) A1492 and A1493 bind non-specifically to the mRNA through a series of hydrogen bonds; and (4) C1400 lies in close proximity to the P-site tRNA wobble base in order to satisfy a UV-induced photocrosslink formed between the two residues. We have models with both major groove and minor groove binding of the tRNA/mRNA complex to the decoding site RNA, and conclude that major groove binding is more likely. Both classes of models maintain structural features reported in the NMR structure of the A-site region of the decoding site RNA with bound paromomycin. We also present models for the tRNA/mRNA complex bound to the decoding site RNA in the presence of the aminoglycoside paromomycin. We discuss possible mechanisms for ribosomal proof reading and antibiotic disruption of this proofreading.
电子冷冻显微镜揭示易位前和易位后核糖体中 tRNA 的排列
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影响因子: 14.9
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通讯作者: HARVEY, SC
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