Equilibrium Composition of Retinal Isomers in Dark-Adapted Bacteriorhodopsin and Effect of High Pressure Probed by Near-Infrared Raman Spectroscopy
Equilibrium Composition of Retinal Isomers in Dark-Adapted Bacteriorhodopsin and Effect of High Pressure Probed by Near-Infrared Raman Spectroscopy
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近红外拉曼光谱探测暗适应细菌视紫红质视网膜异构体的平衡组成及高压效应
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发表时间:
1995
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影响因子:
--
通讯作者:
C. Williams
中科院分区:
文献类型:
--
作者:
A. Schulte;L. Bradley;C. Williams
The combination of near-infrared Raman spectroscopy and variations in external parameters offers new opportunities for site-specific studies of proteins. Using excitation at 840 nm, we have measured the near-infrared Raman spectrum of dark-adapted bacteriorhodopsin at ambient and high pressure. The C=C ethylenic stretching region shows two resolved bands at 1526 and 1534 cm−1, corresponding to the all-trans and 13-cis isomers. From deconvolution of these bands we find an isomeric ratio between 13-cis and all-trans retinal equal to 1 at ambient pressure. The Raman spectrum gives direct spectroscopic evidence that the 13-cis component is favored at high pressure, implying that it has a smaller volume. The pressure dependence of the isomeric ratio yields a molar volume of −6.6 mL/mol, which suggests ionization of one or two residues or the formation of three hydrogen bonds.
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