小型のリボエンザイムによる割れには欠かせないイミノ群の特定

Robert C Spitale¹, Rosaria Volpini, Moriah G Heller

¹Department of Chemistry, University of Rochester, RC Box 270216, Rochester, New York 14627-0216, USA.

Journal of the American Chemical Society

|April 10, 2009

まとめ

ヘアピンのリボ酵素であるリボ酵素は,

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:

非コーディングRNA (ncRNA) であるヘアピンリボ酵素は,RNAの分裂を触媒化する.
以前の研究では,アデ38アミジン群が触媒作用において極めて重要であることが判明した.
Ade38を標的とした突然変異は,活性部位の誤折れを引き起こし,機能分析を妨げました.

研究の目的:

ヘアピンリボエンザイム触媒におけるAde38イミノ群の役割を調査する.
保守的なN1-deazaadenosine改変を用いて,構造と機能の関係を探求する.
リボエンザイム活性に対する正確な化学的要件を理解するために.

主な方法:

N1-デアザアデノシンをヘアピンリボ酵素に合成して組み込む.
触媒活性を測定するための生化学的測定法.
活性部位の構造を決定するX線結晶学.

主要な成果:

N1-deazaadenosineの変種は,リボエンザイム活性を著しく低下させた.
結晶構造は,活性部位の折りたたみが機能障害にもかかわらず無傷のまま残っていることを明らかにしました.
イミノ群とその基板相互作用は,触媒作用に不可欠である.

結論:

Ade38のイミノ分子は,ヘアピンリボ酵素機能に不可欠である.
単原子改変は,ncRNAの構造-機能の研究に有効です.
この研究は,RNA触媒における特定の化学群の役割を明らかにしています.

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