カルモジュリンとのCa(2+) チャンネル接続性の酵素阻害剤のようなチューニング
Xiaodong Liu1, Philemon S Yang, Wanjun Yang
1Calcium Signals Laboratory, Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Ross Building, Room 713, 720 Rutland Avenue, Baltimore, Maryland 21205, USA.
Nature
|February 9, 2010
まとめ
カルシウム (Ca2+) 経路とカルモジュリン (CaM) 相互作用は,細胞機能にとって極めて重要です. 新しい研究は,CaMレベルがCa2+チャネル活性に影響し,Ca2+ホメオスタシスに影響することを示しています.
科学分野:
- 分子および細胞生物学
- 神経科学は神経科学である.
- 心臓病学 心臓病学
背景:
- カルシウム (Ca2+) チャンネルとカルモジュリン (CaM) は,重要なシグナリングハブです.
- CaMはCaV1-2のCa2+チャネル開通を調節し,Ca2+フリーなCaM (apoCaM) はチャネルのIQ領域と事前に関連付けられています.
研究 の 目的:
- 生体細胞におけるCaMによるCa2+チャネルの濃度依存的調節を調査する.
- Ca2+チャネル-CaM濃度の独立性に関する支配的な見解に異議を唱えるため.
主な方法:
- 結合電生理学でチャネル機能を評価する.
- 光学光共振エネルギー転送 (FRET) は,生きている細胞における自由アポカム濃度を測定する.
主要な成果:
- Ca2+チャネル-CaM濃度の独立性に関する特定された例外.
- CaV1.3とCaV1.4チャネルの長いスプライス形態は,アポCaM親和性を変化させるカーボキシ尾を持っている.
- CaM濃度の自然な変動は,Ca2+フィードバック変調の強さに影響を及ぼします.
結論:
- 周囲のCaMレベルは,特定のCa2+チャネルイソフォームを通じたCa2+の侵入を著しく影響する.
- この発見は,Ca2+ホメオスタシスと細胞シグナル伝達に広範な影響を及ぼします.
- Ca2+チャネル-CaM相互作用を研究するための in situ 方法を開発しました.
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