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ポリコンブ抑制におけるglycosyltransferase sxc/Ogtの重要な役割について
Maria Cristina Gambetta1, Katarzyna Oktaba, Jürg Müller
1Gene Expression Programme, European Molecular Biology Laboratory (EMBL), Meyerhofstrasse 1, 69117 Heidelberg, Germany.
まとめ
ドロソフィラ遺伝子のスーパーセックスカンブス (sxc) は,O-リンクされたN-アセチルグルコサミン (O-GlcNAc) 移転酶 (Ogt) をコードする. O-GlcNAcの改変は,ポリコンブ群のタンパク質が発達中に転写抑制を維持するために不可欠です.
科学分野:
- 発達生物学 発達生物学とは
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
背景:
- ポリコンブ群 (PcG) タンパク質は,重要な保存された転写抑制剤である.
- PcGタンパク質は,動物や植物の発達に不可欠な遺伝子発現を調節する.
研究 の 目的:
- ドロソフィラ遺伝子の分子機能を特定するには,スーパーセックスコンブ (sxc).
- ポリコンブグループ媒介の転写抑制におけるSxc/Ogtの役割を調査する.
主な方法:
- ドロソフィラの全ゲノムをプロファイリングして,GlcNAc改変タンパク質を特定する.
- sxc/Ogt-nullミュータントの分析により,ポリコンブ抑制への影響を評価した.
- ポリコンブ群のタンパク質のイン・ビヴォ・グリコシライゼーション測定法.
主要な成果:
- ドロソフィラ sxc遺伝子はO-GlcNAc移転酵素 (Ogt) をコードする.
- GlcNAcによって改変されたタンパク質は,ポリコンブ反応要素で濃縮されています.
- ポリホメオティックタンパク質は,Sxc/Ogt.によってグリコシル化されます.
- sxc/Ogt-null変異体は,O-リンクされたGlcNAcylationの喪失を示し,PcG抑制を維持することができません.
- PcGタンパク質複合体は,変異体の標的部位に結合しますが,抑制は失われます.
結論:
- Sxc/Ogt媒介によるポリホメオティックのグリコシル化が,ドロソフィラのポリコンブ抑制に不可欠である.
- O-GlcNAcylationは,PcG媒介による発達制御の重要な規制メカニズムである.
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