On the role of tryptophan as a superexchange mediator for quinone reduction in photosynthetic reaction centers

M. Plato; M. E. Michel-Beyerle; M. Bixon; J. Jortner

doi:10.1016/0014-5793(89)80018-3

On the role of tryptophan as a superexchange mediator for quinone reduction in photosynthetic reaction centers

M. Plato^*, M. E. Michel-Beyerle, M. Bixon, J. Jortner

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

The role of tryptophan (W) in the quinone reduction in the reaction centers of R. viridis and Rb. sphaeroides is studied by a quantum chemical calculation of the electronic coupling matrix elements within the bacteriopheophytin-W-quinone subsystem, which is based on the X-ray structural data. The results favor the superexchange mechanism via W over the direct coupling. Uncertainties in the available X-ray coordinates and structural relaxation accompanying the formation of the P⁺H^- state result in large changes in the relative contributions of the electronic couplings due to electron and hole superexchange. Aromatic amino acid residues may serve as essential functional components in electron transfer.

Original language	English
Pages (from-to)	70-74
Number of pages	5
Journal	FEBS Letters
Volume	249
Issue number	1
DOIs	https://doi.org/10.1016/0014-5793(89)80018-3
State	Published - 22 May 1989

Keywords

Electronic superexchange coupling
Quinone reduction
Reaction center
Tryptophan

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10.1016/0014-5793(89)80018-3

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abstract = "The role of tryptophan (W) in the quinone reduction in the reaction centers of R. viridis and Rb. sphaeroides is studied by a quantum chemical calculation of the electronic coupling matrix elements within the bacteriopheophytin-W-quinone subsystem, which is based on the X-ray structural data. The results favor the superexchange mechanism via W over the direct coupling. Uncertainties in the available X-ray coordinates and structural relaxation accompanying the formation of the P+H- state result in large changes in the relative contributions of the electronic couplings due to electron and hole superexchange. Aromatic amino acid residues may serve as essential functional components in electron transfer.",

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AU - Plato, M.

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AU - Bixon, M.

AU - Jortner, J.

PY - 1989/5/22

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AB - The role of tryptophan (W) in the quinone reduction in the reaction centers of R. viridis and Rb. sphaeroides is studied by a quantum chemical calculation of the electronic coupling matrix elements within the bacteriopheophytin-W-quinone subsystem, which is based on the X-ray structural data. The results favor the superexchange mechanism via W over the direct coupling. Uncertainties in the available X-ray coordinates and structural relaxation accompanying the formation of the P+H- state result in large changes in the relative contributions of the electronic couplings due to electron and hole superexchange. Aromatic amino acid residues may serve as essential functional components in electron transfer.

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On the role of tryptophan as a superexchange mediator for quinone reduction in photosynthetic reaction centers

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Keywords

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