表現クローニングと腎臓の電気的Na+/HCO3-コトランスポーターの特徴づけ
M F Romero1, M A Hediger, E L Boulpaep
1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA. mromero@biomed.med.yale.edu
Nature
|May 22, 1997
まとめ
研究者らは,新しい二酸化炭素ナトリウムコトランスポーター (NBC) を特定した. この電生成トランスポーターは,動物細胞,特に腎臓のpH調節に不可欠であり,クローン化と特徴づけに成功しています.
科学分野:
- 生理学 生理学とは
- 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:
- ビカルボネートトランスポーターは,動物細胞の細胞内pHの重要な調節体です.
- これらは,腎臓を含む様々な臓器における酸塩バランスの維持に不可欠です.
- 多くの二酸化炭素媒介体,特にカチオン結合媒介体の知識は依然として限られている.
研究 の 目的:
- 新型カチオン結合バイカーボネートトランスポーターをクローンし,特徴づけること.
- エレクトロゲン性腎臓用二酸化ナトリウムコトランスポーター (NBC) の分子基盤を特定する.
主な方法:
- 細胞内pHとXenopus卵細胞の膜電圧のモニタリング.
- バイカーボネートトランスポーターをコードする候補cDNAのクローン化と発現.
- 発現したタンパク質の機能的特徴,イオン依存性と阻害剤感受性を含む.
主要な成果:
- 1,035アミノ酸のタンパク質をコードするcDNAのクローン化と特徴付けに成功した.
- Xenopus卵細胞での発現は,タンパク質が電産であり,ナトリウム (Na+) と二酸化炭素 (HCO3-) に依存することを確認した.
- トランスポーターの活動は,二酸化炭素輸送と一致するDIDSによって抑制されました.
結論:
- クローンされたcDNAは,腎臓の電気的二酸化ナトリウム炭酸コトランスポーター (NBC) をコードする.
- この発見は,動物の生理学におけるpH調節メカニズムの理解を前進させる.
- この研究は,酸塩恒常性に関与する重要なトランスポーターの分子基盤を提供する.
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