オートアンチゲンLaの特徴は,核酸依存性ATPase/dATPaseであり,融解性を持つものである
M Bachmann1, K Pfeifer, H C Schröder
1Institut für Physiologische Chemie Universität, Mainz, Federal Republic of Germany.
Cell
|January 12, 1990
まとめ
転写因子であるLaタンパク質はATPase活性を示し,DNA-RNAハイブリッドを溶かすことができます. Anti-La抗体とシアリダース治療は,その酵素機能を調節し,RNAポリメラーゼIII調節に関する洞察を明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 遺伝子規制 遺伝子規制
背景:
- オートアンチゲンLaタンパク質は,RNAポリメラーゼIIIの重要な転写終止因子である.
- Laタンパク質の酵素活性や規制メカニズムを理解することは,遺伝子発現制御を理解するために不可欠です.
研究 の 目的:
- 異なる源からのオートアンチゲンLaタンパク質を浄化し,特徴づけます.
- Laタンパク質のATPアゼ/dATPアゼ活性とその核酸との相互作用を調査する.
- 抗体の役割とLaタンパク質の機能を調節する酵素的修正の役割を調査する.
主な方法:
- ネズミの3T3細胞と小牛の胸腺からのLaタンパク質の均質な浄化.
- 仔牛のチムスのLaタンパク質をRNA結合および結合しないサブクラスに分割する.
- 核酸ハイブリッドの存在下でのATPase/dATPase活性に対する測定.
- モノクローンおよび患者由来のanti-La抗体を用いた抑制研究.
- ATPの水解を必要とするDNA-RNAハイブリッドの融解アッセイ.
- RNA結合と溶解活動の回復を評価するためにシアリダース治療.
主要な成果:
- ネズミと小牛の両方の乳頭筋からの浄化されたLaタンパク質は,DNA-RNAまたはRNA-RNAハイブリッドとの間でATPase/dATPaseの活性を示した.
- 仔牛のチムスのRNA結合サブクラスであるLaタンパク質は,この酵素活性を示した.
- 新型モノクローナル抗体 (La11G7) と患者の抗La抗体の両方が,Laタンパク質の酵素活性を抑制しました.
- このタンパク質は,合成DNA-RNAハイブリッドのATP-水解に依存した溶解を可能にした.
- シアリダース治療は,RNA結合能力とATP依存の溶融活性を,Laタンパク質の非結合サブクラスに回復させた.
結論:
- オートアンチゲンLaタンパク質は,核酸ハイブリッド溶解を含むATP依存の酵素活性を持っています.
- Anti-La抗体はLaタンパク質の酵素的機能を調節することができ,これは自己免疫反応における役割を示唆しています.
- シアリレーションなどの翻訳後の改変は,Laタンパク質のRNA結合および酵素特性に影響を与え,転写終結におけるその役割に影響を与えます.
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