Bacteriorhodopsin (BR) from the purple membrane of Haiobacterium halobium contains covalently bound retinal in the 13‐ cis and all‐ trans configurations. Several forms of bacteriorhodopsin are known, with different absorption maxima which are designated as BRλ max (nm). At acidic pH, BR605 is formed from BR560. The following sequence of reactions was found, which is initiated by irradiation of BR605 with red light: An all‐ trans /13‐ cis to 9‐ cis isomerisation occurs in the light induced reaction BR605 ∼ BR500. BR500 seems to contain covalently bound retinal, whereas BR390 contains free retinal. By irradiation with light, BR500, BR450 and BR390 can be reconverted to BR560.
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Fischer et al. (1981) studied this question.
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