We study a model of a light-induced proton pump in artificial reaction centers. The model contains a molecular triad with four electron states (i.e., one donor state, two photosensitive group states, and one acceptor state) as well as a molecular shuttle having one electron and one proton-binding sites. The shuttle diffuses between the sides of the membrane and translocates protons energetically uphill: from the negative side to the positive side of the membrane, harnessing for this purpose the energy of the electron-charge separation produced by light. Using the methods of quantum transport theory we calculate the range of light intensity and transmembrane potentials that maximize both the light-induced proton current and the energy transduction efficiency. We also study the effect of temperature on proton pumping. The light-induced proton pump in our model gives a quantum yield of proton translocation of about 55%. Thus, our results explain previous experiments on these artificial photosynthetic reaction centers.
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21 July 2009
Research Article|
July 17 2009
Modeling light-driven proton pumps in artificial photosynthetic reaction centers
Pulak Kumar Ghosh;
Pulak Kumar Ghosh
1Advanced Science Institute,
The Institute of Physical and Chemical Research (RIKEN)
, Wako-shi, Saitama 351-0198, Japan
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Anatoly Yu. Smirnov;
Anatoly Yu. Smirnov
1Advanced Science Institute,
The Institute of Physical and Chemical Research (RIKEN)
, Wako-shi, Saitama 351-0198, Japan
2Department of Physics, Center for Theoretical Physics,
University of Michigan
, Ann Arbor, Michigan 48109-1040, USA
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Franco Nori
Franco Nori
a)
1Advanced Science Institute,
The Institute of Physical and Chemical Research (RIKEN)
, Wako-shi, Saitama 351-0198, Japan
2Department of Physics, Center for Theoretical Physics,
University of Michigan
, Ann Arbor, Michigan 48109-1040, USA
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a)
Electronic mail: [email protected].
J. Chem. Phys. 131, 035102 (2009)
Article history
Received:
April 02 2009
Accepted:
June 12 2009
Citation
Pulak Kumar Ghosh, Anatoly Yu. Smirnov, Franco Nori; Modeling light-driven proton pumps in artificial photosynthetic reaction centers. J. Chem. Phys. 21 July 2009; 131 (3): 035102. https://doi.org/10.1063/1.3170939
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