Studies of photo-induced protein reactions by spectrally silent reaction dynamics detection methods: applications to the photoreaction of the LOV2 domain of phototropin from Arabidopsis thaliana.
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概要
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Biological function involves a series of chemical reactions of biological molecules, and during these reactions, there are numerous spectrally silent dynamic events that cannot be monitored by absorption or emission spectroscopic techniques. Such spectrally silent dynamics include changes in conformation, intermolecular interactions (hydrogen bonding, hydrophobic interactions), inter-protein interactions (oligomer formation, dissociation reactions) and conformational fluctuations. These events might be associated with biological function. To understand the molecular mechanisms of reactions, time-resolved detection of such dynamics is essential. Recently, it has been shown that time-resolved detection of the refractive index is a powerful tool for measuring dynamic events. This technique is complementary to optical absorption detection methods and the signal contains many unique properties, which are difficult to obtain by other methods. The advantages and methods for signal analyses are described in detail in this review. A typical example of an application of time-resolved refractive index change detection is given in the second part: The photoreaction of the LOV2 domain of a blue light photoreceptor from Arabidopsis Thaliana (phototropin). This article is part of a Special Issue entitled: Protein Dynamics: Experimental and Computational Approaches.
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