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利用结合于F-肌动蛋白的ε-ADP与结合于肌钙蛋白C的NBD-Cl之间的荧光能量转移研究重组细肌丝中的构象变化。

Conformation change in reconstituted thin filament studied with fluorescence energy transfer between epsilon-ADP bound to F-actin and NBD-Cl bound to troponin-C.

作者信息

Miki M

出版信息

Biochim Biophys Acta. 1979 May 23;578(1):96-106. doi: 10.1016/0005-2795(79)90117-x.

DOI:10.1016/0005-2795(79)90117-x
PMID:454674
Abstract

The interaction of troponin and F-actin was studied by the methods of fluorescence energy transfer. We used epsilon-ADP bound to F-actin as a fluorescence donor and 7-chloro-4-nitrobenzo-2-oxa-1,3-diazole bound to troponin-C in troponin as a fluorescence acceptor. The efficiency of the fluorescence energy transfer of this system was larger in the absence of calcium ion than in the presence of calcium ion. This shows that the interaction of troponin with F-actin changes in response to the concentration of calcium ion.

摘要

采用荧光能量转移方法研究了肌钙蛋白与F-肌动蛋白的相互作用。我们将与F-肌动蛋白结合的ε-ADP用作荧光供体,将与肌钙蛋白中肌钙蛋白-C结合的7-氯-4-硝基苯并-2-恶唑-1,3-二唑用作荧光受体。该系统的荧光能量转移效率在无钙离子时比有钙离子时更高。这表明肌钙蛋白与F-肌动蛋白的相互作用随钙离子浓度的变化而改变。

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