Journal of Photoscience
- Volume 9 Issue 2
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- Pages.534-536
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- 2002
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- 1225-8555(pISSN)
FTIR spectroscopy of the two-photon product of sensory rhodopsin I
- Sasaki, Jun (Graduate School of Science, Osaka University) ;
- Kannaka, Masato (Graduate School of Science, Osaka University) ;
- Kandori, Hideki (Department of Applied Chemistry, Nagoya Institute of Technology) ;
- Tokunaga, Fumio (Graduate School of Science, Osaka University)
- Published : 2002.08.01
Abstract
A halophilic archaeon, Halobacterium salinarum, exhibits phototactic behaviors, by which the organism is guided to red-orange light and evades shorter wavelengths of light. The phototaxis is mediated by two retinal proteins, sensory rhodopsin I and II (SRI and SRII), whose structures are analogous to the cognate protein bacteriorhodopsin, a light-driven proton pump. SRI mediates both attractant and repellent swimming behaviors to orange light and near- UV light, respectively. The two different signaling through the single photoreceptor have been ascribed to the presence of two active structures of SRI (S
Keywords
- sensory rhodopsin;
- Fourier transform;
- infrared spectroscopy;
- signaling state;
- conformational changes