リボヌクレアゼIIIによる二重鎖RNA処理のメカニズムに関する構造的洞察
Jianhua Gan1, Joseph E Tropea, Brian P Austin
1Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD 21702, USA.
Cell
|January 28, 2006
まとめ
バクテリアのリボヌクレアースIII (RNaseIII) の結晶構造は,その二重鎖RNA産物と結合し,重要な相互作用を明らかにする. これは,RNA処理に関与するRNase III酵素の触媒機構の洞察を提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
背景:
- リボヌクレアースIII (RNase III) 酵素は,RNA処理に不可欠である.
- これらの酵素は,特に二重鎖RNA (dsRNA) を分割する.
- バクテリアのRNase IIIは,より広いRNase IIIファミリーのモデルとして機能します.
研究 の 目的:
- バクテリアのRNase III産物複合体の結晶構造を決定する.
- RNase IIIによるdsRNA分裂のメカニズムを解明する.
- RNase IIIファミリーのタンパク質-RNA相互作用を理解するために.
主な方法:
- X線結晶グラフィーです.
- タンパク質-RNA複合体の形成
- 構造分析 構造分析とは
主要な成果:
- 触媒RNase III-dsRNA複合体の最初の結晶構造が決定されました.
- 7-残留リンカーは,タンパク質-RNA認識における誘導フィットを可能にします.
- 特定のタンパク質-RNA相互作用モチーフと保存された残留物は,基板特異性と触媒を媒介する.
結論:
- この構造は,RNase IIIの触媒機構の詳細な洞察を提供します.
- この結果は,RNase III酵素ファミリーの他のメンバーにも適用できます.
- これらの相互作用を理解することは,RNA処理の研究の鍵です.
関連する概念動画
01:23RNA 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...
00:58Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
02:53Ribosomal RNA Synthesis
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
02:47Ribozymes
The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Ribozymes can be...
02:47Ribozymes
The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
Ribozymes can be...
Ribozymes can be...
02:53Ribosomal RNA Synthesis
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...