修正されたsiRNAガイドに結合したヒトアルゴナウト-2の構造分析
Nicole T Schirle1, Garth A Kinberger2, Heather F Murray2
1Department of Integrative Computational and Structural Biology, The Scripps Research Institute , La Jolla, California 92037, United States.
Journal of the American Chemical Society
|July 6, 2016
まとめ
化学的に改変された小さな干渉RNA (siRNAs) は,構造的シフトにもかかわらず,Argonaute- 2 (Ago2) との相互作用を維持する. これらの改変は,治療用 siRNA 設計に役立つ柔軟性を提供します.
科学分野:
- 生物化学
- 分子生物学
- 構造生物学
背景:
- 化学的変化により,小干渉RNA (siRNA) の安定性と分布が強化される.
- Argonaute- 2 (Ago2) との siRNA相互作用に対するこれらの変更の影響は不明である.
研究 の 目的:
- アゴ2結合に対する siRNA 化学的変化の構造的影響を明らかにする.
- 改変した siRNA が分子標的である Ago2 とどのように相互作用するかを理解する.
主な方法:
- 改変されたsiRNAに結合したヒトAgo2の構造を決定するX線結晶学.
- 改変されたsiRNA-Ago2複合体の構造と改変されていないsiRNA-Ago2複合体の比較.
主要な成果:
- Ago2の全体的な構造は,siRNAの化学的変化によってほとんど影響を受けません.
- 改変されたsiRNAは,アゴ2との接触を最適化して,形状の可塑性を高める.
- siRNA 3'シード領域における重要な形状の変化は,ノックダウン効能に最小限の影響を及ぼします.
結論:
- siRNAsの化学的変異はAgo2結合を妨げず,可塑性によって相互作用を高めることができます.
- これらの発見は,siRNAの様々な改変パターンの耐性を支持する.
- 先進的な治療用 siRNA 設計の開発のための構造的基礎を提供します.
さらに関連する動画
関連する概念動画
RNA Interference
28.5K
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...
28.5K
siRNA - Small Interfering RNAs
19.0K
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...
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...
19.0K
RNA Editing
10.1K
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
10.1K
Conservation of Protein Domains Over Different Proteins
14.9K
Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
14.9K
Experimental RNAi
8.2K
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...
8.2K
Nucleic Acid Structure
9.9K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
DNA Structure
DNA...
9.9K


