タンデム・バイオオートホグナル・ラベリングにより,内在的なコトランスレーションによるO-GlcNAc変異した新生タンパク質が発見された
Yanping Zhu1,2, Lianne I Willems1, Daniela Salas1,3
1Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
Journal of the American Chemical Society
|September 2, 2020
まとめ
この研究では,O-GlcNAcによって翻訳中に変化した内生タンパク質を特定し,タンパク質の恒常性のための新しいメカニズムを明らかにしました. これらの発見は,O-GlcNAcの理解を深める.
科学分野:
- 生物化学
- 分子生物学
- 細胞生物学
背景:
- セリン/スレオニン残基のO-GlcNAc変異は,細胞生理学と健康にとって極めて重要です.
- O-GlcNAcは,細胞タンパク質の恒常性の重要な調節剤として浮上しています.
- 以前の研究では,O-GlcNAcの改変が共翻訳的に起こり,新生ポリペプチドの分解を防ぐことが示された.
研究 の 目的:
- 内在的にO-GlcNAc改変された新生ポリペプチド鎖の標識と識別のための戦略を開発する.
- プロテオスタシスとタンパク質品質の制御におけるコトランスレーション性O-GlcNAcの役割を調査する.
- コトランスレーションによるO-GlcNAc改変を受けた特定の内生タンパク質を特定する.
主な方法:
- O-プロパルギル-プロマイシン (O-propargyl-puromycin, OPP) を使用したタンデム代謝工学で,新生鎖を標識する.
- テトラ-O-アセチル-2-N-アジドアセチル-2-デオキシ-d-ガラクトピラノース (Ac4GalNAz) を用いてO-GlcNAcを標的とする代謝サッカリド工学.
- 強力なラベリングのための連続化学選択結合戦略.
- グライコシル化新生鎖の2段階の濃縮に続いて,ショットガンプロテオミクスを行う.
主要な成果:
- O-GlcNAcで改変された内生性タンパク質のラベル付けと識別が成功しました.
- 3つの特定されたタンパク質の共翻訳性O-GlcNAcylationの検証.
- 複合混合物から少量の内生分析剤を分離する戦略の実証
結論:
- コトランスレーションによるO-GlcNAc改変タンパク質を分離し,特定するための新しい方法を開発した.
- 細胞質タンパク質の品質管理におけるO-GlcNAcの役割についての洞察を提供した.
- プロテオスタシスにおけるコトランスレーション性タンパク質改変のより広範な役割を研究するための道が開かれました.
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