Journal
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
Volume 42, Issue 4, Pages 257-265Publisher
SPRINGER
DOI: 10.1007/s00249-012-0870-0
Keywords
Proton pump; Photoelectric current; pH dependence; Equivalent circuit; Electromotive force
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Funding
- Chuo University
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [21570172]
- Grants-in-Aid for Scientific Research [20118010, 21570172, 24570187] Funding Source: KAKEN
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In this study, we analyzed the photoelectric current generated by bacteriorhodopsin adsorbed on a polymer film, Lumirror (Muneyuki et al. in FEBS Lett 427:109-114, 1998). We could examine the photoelectric current over a wide range of light intensity and pH values using the same membrane owing to the mechanical and chemical stability of the thin polymer film. We analyzed the photoelectric current by comparison with a simple equivalent electric circuit. Analysis of experimental results obtained at different light intensities suggested that the electromotive force of the bacteriorhodopsin was independent of light intensity. The pH dependence of the photoelectric current suggested that the bacteriorhodopsin could generate a maximum electromotive force at approximately pH 6.
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