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- W2009803485 abstract "pharaonis phoborhodopsin (ppR; also called pharaonis sensory rhodopsin II, psR-II) is a photoreceptor for negative phototaxis in Natronobacterium pharaonis. Recent X-ray crystallographic structures showed that ppR and bacteriorhodopsin (BR), a light-driven proton pump, possess similar molecular environments of the retinal Schiff base. Nevertheless, absorption spectra are different by 70 nm between ppR and BR, suggesting the different chromophore-protein interactions involving the Schiff base region. In this article, we identify frequencies of the Schiff base vibrations in the ppR(K) minus ppR difference spectra by means of low-temperature FTIR spectroscopy of [zeta-(15)N]lysine-labeled ppR. The N-D stretch in D(2)O was found at 2140 and 2091 cm(-1) for ppR, which are shifted to a lower frequency by 32-33 cm(-1) compared to those for BR. This observation indicates the stronger hydrogen bond of the Schiff base in ppR than in BR. The N-D stretch of the Schiff base and O-D stretch of water molecules are located at the different frequencies in ppR, while they appear in the same frequency region in BR [Kandori, H., Belenky, M., and Herzfeld, J. (2002) Biochemistry 41, 6026-6031]. These differences could be correlated with the distorted pentagonal cluster structure in ppR. In contrast, the N-D stretch of ppR(K) was found at 2474 cm(-1), which is close in frequency to that of BR(K). The O-D stretch of Thr79 was also assigned at 2512 and 2474 cm(-1) for ppR and ppR(K), respectively. These frequencies are close to those of BR, suggesting the interaction of Thr79 and Asp75 in ppR is similar to that of Thr89 and Asp85 in BR." @default.
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- W2009803485 date "2003-05-28" @default.
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- W2009803485 title "Vibrational Modes of the Protonated Schiff Base in <i>pharaonis</i> Phoborhodopsin" @default.
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- W2009803485 doi "https://doi.org/10.1021/bi034284m" @default.
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