Environmental control of primary photochemistry in a mutant bacterial reaction center

Article Abstract:

The issues in the L168HE/L170ND mutant are explored as a function of the interplay between excitation wavelength, pH and the identity of the detergent. The mechanism that links B(sub B)+H(sub B) stabilization to the change in the photochemistry of P (the special pair of bacteriochlorophylls) in the mutant is not understood, but clearly these processes are linked and highly sensitive to the local electrostatic environment produced by buffering conditions (pH and detergent).

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Increasing the rate of energy transfer between the LHI antenna and the reaction center in the photosynthetic bacterium rhodobacter sphaeroides

Article Abstract:

An investigation was conducted on the energy transfer from rhodobacter sphaeroides light-harvesting complex I (LHI) to the reaction center (RC) with steady state and time-resolved fluorescence spectroscopy. According to Forster energy transfer theory, the acceleration of energy transfer was consistent with the increase in the energy transfer rate estimated from the spectral overlap between the RC absorbance and the LHI fluorescence.

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High yield of long-lived B-side charge separation at room temperature in mutant bacterial reaction centers

Article Abstract:

The pathway and kinetics of electron transfer in the mutants after exciting higher-energy electronic states of the reaction center is studied. There is a rich variety of photochemistry possible in the reaction center, however the pathway and the products of light induced charge separation depend on the interplay between local electrostatic interactions and the nature of the excited states available at the early times.

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