RNAに結合するtrp RNA結合減弱タンパク質,TRAPの構造
A A Antson1, E J Dodson, G Dodson
1York Structural Biology Laboratory, Department of Chemistry, University of York, UK. fred@yorvic.york.ac.uk
Nature
|September 28, 1999
まとめ
trpRNA結合減弱タンパク質 (TRAP) は単一鎖RNAを結合し,遺伝子発現を調節する. その結晶構造は,転写および翻訳制御のためのRNAを囲むメカニズムを明らかにします.
科学分野:
- 構造生物学 構造生物学とは
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- トリプトファンRNA結合減衰タンパク質 (TRAP) は,バシリにおけるトリプトファン生物合成の調節に極めて重要です.
- TRAPは,特定の単一鎖RNA配列に結合することで機能します.
研究 の 目的:
- TRAP-RNA相互作用の構造的基礎を解明する.
- トラップがトランスクリプションおよびトランスレーションレベルで遺伝子発現を調節するメカニズムを理解する.
主な方法:
- X線結晶学を用いて,TRAP-RNA複合体の構造を決定した.
- 複合体内のタンパク質-RNA相互作用の分析.
主要な成果:
- 結晶構造は,TRAPが11のGAGトリプルツを含む53塩基単一鎖RNAを包囲していることを示しています.
- それぞれのRNAトリプレットは,TRAPタンパク質のβ鎖によって形成された特定のポケットに結合します.
- RNAは,拡張された,塩基配列の無い形状を採用し,特定のタンパク質と塩基の接触を通して相互作用します.
結論:
- TRAPは,11個の結合ポケットを持つタンパク質ディスクを形成することによって,RNAを結合するユニークなメカニズムを使用しています.
- この構造的配置により,TRAPはRNAセグメントを効果的に逮捕し,トリプトファン生物合成遺伝子の転写と翻訳の両方を調節することができます.
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