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Wu J, Ma D, Wang Y, Ming M, Balashov SP, Ding J. Efficient Approach to Determine the pKa of the Proton Release Complex in the Photocycle of Retinal Proteins. J Phys Chem B 2009; 113:4482-91. [DOI: 10.1021/jp804838h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jia Wu
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University, Shanghai 200433, China and Department of Physiology and Biophysics, University of California, Irvine 92697, USA
| | - Dewang Ma
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University, Shanghai 200433, China and Department of Physiology and Biophysics, University of California, Irvine 92697, USA
| | - Yazhuo Wang
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University, Shanghai 200433, China and Department of Physiology and Biophysics, University of California, Irvine 92697, USA
| | - Ming Ming
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University, Shanghai 200433, China and Department of Physiology and Biophysics, University of California, Irvine 92697, USA
| | - Sergei P. Balashov
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University, Shanghai 200433, China and Department of Physiology and Biophysics, University of California, Irvine 92697, USA
| | - Jiandong Ding
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University, Shanghai 200433, China and Department of Physiology and Biophysics, University of California, Irvine 92697, USA
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Koyama K, Miyasaka T, Needleman R, Lanyi JK. Photoelectrochemical Verification of Proton-Releasing Groups in Bacteriorhodopsin. Photochem Photobiol 2008. [DOI: 10.1111/j.1751-1097.1998.tb09699.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Quantum yields for the light adaptations in Anabaena sensory rhodopsin and bacteriorhodopsin. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.01.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Saga Y, Ishikawa T, Watanabe T. Effect of metal ion exchange on the photocurrent response from bacteriorhodopsin on tin oxide electrodes. Bioelectrochemistry 2002; 57:17-22. [PMID: 12049752 DOI: 10.1016/s1567-5394(01)00173-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The transient photocurrent response from bacteriorhodopsin (bR) on tin oxide electrodes was strongly influenced by metal ions bound to bR molecules. The photocurrent polarity reversal pH, which corresponded to the pH value for the reversal of the proton release/uptake sequence in the bR photocycle, of cation-substituted purple membrane (PM) was shifted to lower pH with the increase in the cation affinities to carboxyl groups and a close correlation was noted between the two values. This suggests that the metal ion present in the extracellular region of a bR molecule modulates the pK(a) of proton release groups of bR by stabilizing the ionized state of the proton-releasing glutamic acids. The behavior of photocurrents at light-off in alkaline media, reflecting the proton uptake by bR, was unchanged by binding monovalent (Na(+) and K(+)) or divalent cations (Mg(2+) and Ca(2+)), but was drastically changed by binding La(3+) ions. This can be explained by invoking a substantial slowing of the proton uptake process in the presence of La(3+).
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Affiliation(s)
- Yoshitaka Saga
- Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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Chen DL, Wang GY, Xu B, Hu KS. All-trans to 13-cis retinal isomerization in light-adapted bacteriorhodopsin at acidic pH. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2002; 66:188-94. [PMID: 11960728 DOI: 10.1016/s1011-1344(02)00245-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The flash photolysis kinetic spectra of the intermediate M(412) of bacteriorhodopsin were monitored during the process of acid titration. In the light-adapted state, the maximum peak amplitude of M(412) absorbance of bacteriorhodopsin decreased (pK(a)=3.40+/-0.05) as the pH decreased from 7.3 to 1.9. In the dark-adapted state, the maximum peak amplitude of M(412) absorbance of bacteriorhodopsin increased as the pH decreased from 6.9 to 4.1, and then decreased (pK(a)=2.85+/-0.05) as the pH dropped to 2.1. These different trends in the change in the maximum peak amplitude suggested that not only the transition of purple membrane to blue membrane had taken place in both light and dark-adapted states, but also the fraction of all-trans-bR had changed during the acid titration. The pH-dependent absorption changes at 640 nm of bacteriorhodopsin in both light- and dark-adapted states were also observed. The pK(a)-values of the purple-to-blue transition were 3.80+/-0.05 in light-adapted state and 3.40+/-0.05 in dark-adapted state, respectively. According to Balashov's method, the fraction of all-trans-bR was assayed as the pH decreased. All these results indicated that the purple-to-blue transition of light-adapted bacteriorhodopsin was accompanied by an all-trans to 13-cis retinal isomerization at acidic pH.
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Affiliation(s)
- De-liang Chen
- Institute of Biophysics, Academia Sinica, 15 Datun Rd., Beijing 100101, PR China
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Iwamoto M, Shimono K, Sumi M, Koyama K, Kamo N. Light-Induced Proton Uptake and Release of pharaonis Phoborhodopsin Detected by a Photoelectrochemical Cell. J Phys Chem B 1999. [DOI: 10.1021/jp992168g] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masayuki Iwamoto
- Laboratory of Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, and Ashigara Research Laboratories, Fuji Photo Film Co., Ltd., Minamiashigara, Japan
| | - Kazumi Shimono
- Laboratory of Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, and Ashigara Research Laboratories, Fuji Photo Film Co., Ltd., Minamiashigara, Japan
| | - Masato Sumi
- Laboratory of Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, and Ashigara Research Laboratories, Fuji Photo Film Co., Ltd., Minamiashigara, Japan
| | - Koichi Koyama
- Laboratory of Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, and Ashigara Research Laboratories, Fuji Photo Film Co., Ltd., Minamiashigara, Japan
| | - Naoki Kamo
- Laboratory of Biophysical Chemistry, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan, and Ashigara Research Laboratories, Fuji Photo Film Co., Ltd., Minamiashigara, Japan
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Ohtani H, Kikuchi O. Excitation Spectrum of the N Intermediate in the Photocycle of Bacteriorhodopsin. J Phys Chem B 1999. [DOI: 10.1021/jp991629v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroyuki Ohtani
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama 226-8501, Japan
| | - Osayasu Kikuchi
- Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259, Nagatsuta, Midori-ku, Yokohama 226-8501, Japan
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Koyama K, Miyasaka T, Needleman R, Lanyi JK. Lifetime of M Intermediate in the D96N Mutant of Bacteriorhodopsin Determined by a Photoelectrochemical Method. CHEM LETT 1999. [DOI: 10.1246/cl.1999.769] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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