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The UV light absorbing species of proteorhodopsin with deprotonated Schiff base retinal was investigated using steady-state fluorescence and femtosecond pump-probe spectroscopy. Compared to the all- trans  retinal with protonated Schiff base, the deprotonated chromophore absorbs at 365 nm and exhibits a blue-shifted fluorescence spectrum. The unusually long-lived excited state decays bi-exponentially with time constants of 8 ps and 130 ps to form a deprotonated 13- cis  retinal as the primary photo-product.

Fluorescence and excited state dynamics of the deprotonated Schiff base retinal in proteorhodopsin