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V(D) J再結合活性化タンパク質RAG-2をリン酸化によって調節する
1Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205.
Science (New York, N.Y.)
|May 14, 1993
まとめ
リコンビネーションアクティベーター遺伝子2 (RAG-2) のタンパク質の安定性は,リン酸化によって調節されます. 特定の部位,特にp34cdc2キナーゼによるスレオニン490によるリン酸化は,RAG-2の分解を誘発し,V(D) Jの再編成に影響を及ぼします.
科学分野:
- 免疫学 免疫学とは
- 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
背景:
- V(D) Jの再編成は,抗原受容体遺伝子を組み立て,適応性免疫システムの発達に不可欠です.
- 再結合活性化遺伝子のRAG-1とRAG-2は,V(D) J再結合に不可欠である.
- RAGタンパク質の活性と安定性の調節は,適切な免疫細胞の発達に不可欠です.
研究 の 目的:
- RAG-2タンパク質の活性と安定性を調節する際にリン酸化が果たす役割を調査する.
- RAG-2の特定のリン酸化部位とその機能的影響を特定する.
- リン酸化とタンパク質の分解を結びつける一般的なメカニズムの可能性を調査する.
主な方法:
- 線維芽細胞におけるRAG-2のリン酸化分析.
- p34cdc2キナーゼを用いたインビトロキナーゼアッセイ.
- キメリックRAG-2タンパク質の構築と分析.
- 酸化部位のサイト・ダイレクト・ミュータゲネシス,p53を含む.
主要な成果:
- RAG-2タンパク質は,線維芽細胞の2つのセリン残基でリン酸化され,その活性に影響します.
- in vitroではp34cdc2キナーゼによるスレオニン490のリン酸化は,in vivoではRAG-2の分解につながります.
- RAG-2の90の残留領域は不安定性を媒介する.
- p53のp34cdc2部位が変異すると,同様の分解フェノタイプが生じる.
結論:
- リン酸化は,RAG-2タンパク質の安定性に対する重要な規制メカニズムです.
- T490のような特定のリン酸化イベントは,RAG-2をターゲットにして,急速な分解を起こす可能性があります.
- p34cdc2のリン酸化とタンパク質の分解の間のリンクは,p53.3のような腫瘍抑制剤を含む,さまざまなタンパク質にわたって保存されたメカニズムであるように思われる.
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