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DNAzyme-dependent Analysis of rRNA 2’-O-Methylation
Published on: September 16, 2019
RlmNとCfrは,リボソームRNAのメチル化に関与する SAM酵素である
Feng Yan1, Jacqueline M LaMarre, Rene Röhrich
1Department of Cellular and Molecular Pharmacology, University of California, San Francisco, 600 16th Street, San Francisco, California 94158, USA.
Journal of the American Chemical Society
|February 27, 2010
まとめ
この研究では,細菌の酵素RlmNとCfrが,抗生物質耐性における重要なステップであるリボソームRNA (rRNA) をメチレートする方法が明らかにされています. これらのラジカルSAM酵素は,リボソーム組立中に23SrRNAをメチਲੇਟし,薬の有効性に影響を与えます.
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.
- 微生物学 微生物学とは
背景:
- リボソームRNA (rRNA) の転写後の改変は,リボソーム機能と細菌の抗生物質耐性にとって極めて重要です.
- RlmNおよびCfr酵素によるペプチジルトランスファーゼセンターにおけるアデノシンのメチル化が重要な抵抗メカニズムである.
- RlmNとCfrは,S-アデノシルメチオニン (SAM) をメチルドナーおよびラジカルイニシアターとして利用するラジカルSAMスーパーファミリーに属しています.
研究 の 目的:
- RlmNおよびCfr酵素の in vitro メチル転送活性を特徴づけるために.
- これらのメチルトランスフェラーゼの基板要件とrRNA認識要素を解明する.
- rRNAメチル化タイミングと抗生物質耐性に対する基板特異性の影響を理解する.
主な方法:
- ラジカルSAM酵素によって触媒化されたメチル転移を実証するためのインビトロアッセイ.
- 23S rRNAの要求事項の分析,タンパク質のないrRNAと組み立てられたリボソームサブユニットの比較.
- 基板認識に関与する主要なrRNA構造要素 (ヘリックス90-92およびA2503) の識別.
主要な成果:
- ラジカルSAMスーパーファミリーのメンバーによる最初の in vitro メチル転送が実証されました.
- RlmNとCfrはタンパク質フリー23SrRNAを使用し,リボソームの大型サブユニットを完全に利用していないことが示されました.
- 酵素認識と触媒に不可欠な特定のrRNA構造要素を特定しました.
- メチルドナーとラジカル源の両方としてSAMが確認されました.
結論:
- この研究は,Radical SAM酵素スーパーファミリーの既知の触媒機能を拡張しています.
- RlmNとCfrによるRRNAメチル化は,成熟したリボソームではなく,リボソーム組立中に発生します.
- 発見は,rRNA改変によってもたらされる抗生物質耐性のメカニズムに関する重要な洞察を提供します.
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