收费类受体3用双链RNA信号的结构基础
Lin Liu1, Istvan Botos, Yan Wang
1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
概括
收费类受体3 (TLR3) 通过其ectodomain上的两个位点结合病毒双链RNA (dsRNA). 这种结合稳定了二元体,可能启动炎症信号来对抗病毒感染.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 病毒学 病毒学
背景情况:
- 收费类受体3 (TLR3) 对于天生的免疫非常重要,它能识别病毒双链RNA (dsRNA).
- TLR3的激活会触发对控制病毒传播至关重要的炎症反应.
- 信号传导需要在dsRNA上对TLR3ectodomains (ECDs) 的二元化.
研究的目的:
- 阐明dSRNA通过TLR3.3结合的分子机制.
- 了解dSRNA结合如何诱导TLR3二元化和信号传递.
- 为了确定TLR3-dsRNA相互作用的结构基础.
主要方法:
- 用dRNA复合的小鼠TLR3-ECDs的晶体结构的确定.
- 高分辨率 (3.4安格斯特罗姆) 结构分析.
主要成果:
- 晶体结构显示每个TLR3-ECD上有两个dsRNA结合点,位于马形ectodomain的对立端.
- 在TLR3-ECD C端域之间的分子间接触稳定了dRNA结合后的二分体.
- 在dSRNA结合后,TLR3-ECD的整体形状保持不变.
结论:
- 这些结构数据为dSRNA识别和TLR3ectodomain二元化提供了分子基础.
- 由dsRNA结合介导的TLR3二分化被提议通过细胞质TIR域促进下游信号传输.
- 这项研究提供了关于TLR3.3病毒识别早期事件的见解.
相关概念视频
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This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
RNA Interference
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
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Different Types of RNA Have the Same Basic Structure
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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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