タスパゼ1:MLLの分裂と適切なHOX遺伝子発現のために必要なスレオニンアスパルターゼ
James J-D Hsieh1, Emily H-Y Cheng, Stanley J Korsmeyer
1Howard Hughes Medical Institute, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
Cell
|November 26, 2003
まとめ
研究者らは,混合血統白血病 (MLL) タンパク質の分裂に不可欠なタンパク質Taspase1を特定しました. この分裂は,HOX遺伝子発現と適切な発達を維持するために不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- 混合血統白血病 (MLL) 遺伝子はHOX遺伝子発現に不可欠であり,Drosophila trithorax.に同型である.
- MLLタンパク質はN320とC180の断片に分裂し,それらは安定性と亜核局在性を確保するために異体化します.
研究 の 目的:
- MLLタンパク質の分裂を担当するプロテアスを特定し,クローン化します.
- このMLL分裂プロテアゼの機能と進化的起源を特徴づけるために.
主な方法:
- MLL分裂プロテアゼの浄化とクローン.
- プロテアゼの酵素活性と構造の特徴.
- RNA干渉 (RNAi) は,プロテアゼノックダウンがMLL処理とHOX遺伝子発現に与える影響を評価する.
主要な成果:
- プロテアゼは,N端のスレオニン核フィルを利用するエンドペプチダゼであるTaspase1として特定されました.
- タスパゼ1は分子内裂を経て,活性アルファ/ベータヘテロジマーを形成する.
- Taspase1のノックダウンは,未処理のMLLにつながり,HOX遺伝子発現を妨げました.
結論:
- タスパゼ1は,MLL処理およびその後のHOX遺伝子調節に不可欠です.
- MLLとのTaspase1の共進化は,より高い生物における複雑な体計画の開発におけるその役割を示唆しています.
- タスパゼ1は,N端のスレオニンで始まる新しいプロテアースのクラスを表しています.
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