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RNAサイレンシングのウイルスサプレッサーによる小さな干渉RNAの認識
Keqiong Ye1, Lucy Malinina, Dinshaw J Patel
1Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
Nature
|December 9, 2003
まとめ
ウイルスのp19タンパク質は,小さな干渉RNA (siRNAs) に結合し,RNAサイレンシングを抑制する. 結晶構造は,p19のベータシート内のcradles siRNAを明らかにし,静音化経路をブロックします.
科学分野:
- 分子生物学は分子生物学である.
- ウイルス学 ウイルス学 ウイルス学
- 構造生物学 構造生物学とは
背景:
- RNAサイレンシングは,小さな干渉RNA (siRNA) を含む遺伝子調節メカニズムです.
- 植物は,ウイルス感染症に対する防御としてRNAサイレンシングを使用します.
- ウイルスは,RNAサイレンシングに対抗するために,tombusvirus p19のようなタンパク質をコードします.
研究 の 目的:
- p19-siRNA相互作用の構造的基礎を解明する.
- p19がRNAサイレンシング経路を阻害する方法を理解するために.
主な方法:
- X線結晶学を用いて,siRNAに結合するp19の構造を決定した.
- 分子間接触とタンパク質-siRNA構造の分析.
主要な成果:
- 21核酸シRNAに結合したp19の1.85-Å結晶構造が決定された.
- p19はホモディマーを形成し,その凸のβシート面にsiRNAデュプレックスを抱えている.
- 配列独立結合には,siRNAの骨幹リン酸と糖群との接触が含まれます.
- トリプトファンの残留を積んだアルファヘリクルの"読み取りヘッド"は,siRNA端末の塩基対に堆積する.
結論:
- 構造は,ウイルスサプレッサータンパク質によるsiRNA結合のメカニズムを明らかにします.
- p19の構造は,siRNAsを結合することによってRNAサイレンシングを抑制する能力を説明しています.
- これは,分子レベルでのウイルス-宿主相互作用の洞察を提供します.
関連する概念動画
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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...
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...
siRNA - Small Interfering RNAs
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
Experimental RNAi
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...
Small interfering RNAs (siRNA)
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...

