生物の遺伝子コードにα,α-非置換およびβ結合モノマーを加える
Daniel L Dunkelmann1, Carlos Piedrafita1, Alexandre Dickson1
1Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.
Nature
|January 10, 2024
まとめ
研究者はtRNAディスプレイを開発することで 遺伝コードの拡張における大きな制約を克服しました この新しい方法は,様々な非正規のアミノ酸をタンパク質に組み込み,生命の構成要素を拡大する酵素の直接選択を可能にします.
科学分野:
- 合成生物学
- 生物化学
- 分子生物学
背景:
- 遺伝子コードは非正規のアミノ酸の組み込みを許容するが,リボソーム基板に限定される.
- 合成酵素を設計する現在の方法は,リボソーム基板に依存しており,進化の行き詰まりを生み出しています.
- 生物の細胞で合成されるタンパク質の 化学的多様性を制限します
研究 の 目的:
- 進化の行き詰まりを突破する 遺伝子コードの拡張
- 非リボソーム基板でtRNAをアシレートする合成酵素を選択する方法を開発する.
- 自然のアミノ酸を超えて 遺伝子コードの化学的範囲を拡大する
主な方法:
- オートゴナル合成酵素の直接選択のためのtRNAディスプレイの開発.
- 非正規のモノマー (ncM) で正規のtRNAをアシレートできる合成酵素の選択.
- 新しいアミノ酸の局所特有の細胞結合の実証.
主要な成果:
- 8つの非正規アミノ酸と8つのncmの正規合成酵素を成功裏に選択した.
- β-アミノ酸,α,α-非置換アミノ酸,およびβ-ヒドロキシ酸の選択が含まれています.
- 遺伝子でコードされた β-アミノ酸とα,α-非置換アミノ酸をタンパク質に組み込むことが実証された.
結論:
- tRNAの表示は,遺伝子コードの拡張のためのリボソーム基板依存性の制限を克服します.
- この方法は,より広い範囲の非正規のモノマーのための合成酵素の選択を可能にします.
- タンパク質の化学的多様性と 合成生物学の潜在的応用を拡大します
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