ラクチシン481合成酵素は,ランチビオティック生産中にその基質をリン酸化します
Champak Chatterjee1, Leah M Miller, Yong L Leung
1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Journal of the American Chemical Society
|November 3, 2005
まとめ
ラクチシン481合成酵素 (LctM) はATPを使用してセリン/スレオニン残基をリン酸化し,抗生物質合成を開始します. このリン酸化段階は,酵素にとって極めて重要です.
科学分野:
- バイオケミストリー バイオケミストリー
- 酵素学 酵素学とは
- 分子生物学は分子生物学である.
背景:
- ラクチシン481合成酵素 (LctM) は,多循環型チオエーテル抗生物質ラクチシン481の生成に不可欠な二機能酵素である.
- LctMは,Ser/Thr残基の脱水と,その後のCys結合添加を触媒化し,脱水アミノ酸とチオエーテル結合を形成する.
- LctMの初期活性化ステップの正確なメカニズム,特にATP依存性については,さらなる解明が必要である.
研究 の 目的:
- ラクチシン481合成酵素 (LctM) によって触媒化された初期酵素ステップにおけるATPの役割を調査する.
- ATPが基板残基の脱水またはリン酸化に直接関与するかどうかを判断する.
- LctMが乳チキンの合成を開始するメカニズムの解明 481.
主な方法:
- LctMを切り離されたペプチド基板でインキュベーションする.
- 質量スペクトロメトリとクロマトグラフィを用いた反応産物の分析.
- 合成フォスフォペプチドとADPをコスブストラートとして用いた酵素分析.
主要な成果:
- LctMでインキュブされた切り取られた基板は,脱水領域でリン酸化された.
- 合成のフォスフォセリン/フォスフォトセオニンを含むペプチドは,LctMによって基板として受け入れられた.
- リン酸の除去と脱水アミノ酸の形成は,ADPが存在する場合にのみ発生し,これはリン酸化のためのATPの利用を示しています.
結論:
- ラクチシン481合成酵素 (LctM) は,ATPを利用して標的のSer/Thr残基をリン酸化し,これはラクチシン481生物合成の重要な最初のステップである.
- ペプチドの転位や循環ではなく,ATP依存のリン酸化が,ATPを消費する主な反応であるようです.
- この発見は,酵素媒介のリン酸化によるチオエテル抗生物質の合成を開始するための新しいメカニズムを明らかにしています.
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