トリメリックGタンパク質とラスタンパク質の一般的な改変:ポリイソプレニル化の関与
A A Finegold1, W R Schafer, J Rine
1Department of Biochemistry and Molecular Biology, University of Chicago, IL 60637.
Science (New York, N.Y.)
|July 13, 1990
まとめ
研究者らは,酵母Gタンパク質のガンマサブユニットが膜結合と機能のためにポリイソプレニレーションを必要とすることを発見しました. この発見は,このプロセスの阻害剤のスクリーニングにつながり,がん治療に潜在的に有用です.
科学分野:
- 細胞生物学 細胞生物学
- 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:
- ゲトロトリメリックグアニンヌクレオチド結合調節タンパク質 (Gタンパク質) は,細胞表面受容体からの信号をリレーします.
- これらのGタンパク質は,内側のプラズマ膜と結合しますが,統合膜タンパク質ではありません.
- Rasのタンパク質の処理は,その機能に不可欠です.
研究 の 目的:
- 交配フェロモン信号伝導に関与する酵母Gタンパク質のガンマサブユニットの処理と機能を調査する.
- ラス加工に影響する突然変異が酵母Gタンパク質のガンマサブユニットにも影響するかどうかを判断する.
- 潜在的ながん治療のためのポリイソプレニル化を阻害する薬理学的剤を特定する.
主な方法:
- ラス加工と酵母Gタンパク質ガンマサブユニットに影響を与える変異の比較分析.
- ガンマサブユニットのポリイソプレニル化を評価するための生化学的測定法.
- ポリイソプレニル化の阻害剤を特定するための微生物スクリーンの開発.
主要な成果:
- ラス処理を阻害する突然変異は,酵母Gタンパク質のガンマサブユニットにも影響を及ぼした.
- ガンマ亜単位はポリイソプレニル化されていると暗示された.
- ポリイソプレニル化は,ガンマ亜単体の膜結合と生物学的活性に必要であることが判明しました.
結論:
- 酵母Gタンパク質のガンマサブユニットは,その膜結合と機能に不可欠なポリイソプレニル化を受けます.
- この変更は,ras 変異によって影響を受ける経路と関連しています.
- 新しい微生物スクリーンは,ポリイソプレニル化の阻害剤を特定することができ,がん治療の開発の可能性を提供します.
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関連する概念動画
01:39Mutations
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01:35Mutations
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While point mutations are changes in a single nucleotide in...
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
These groups modify specific amino acids in a protein.