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Roles of proteins in the electron transfer in the photosynthetic reaction center of Rhodopseudomonas viridis : bacteriopheophytin to ubiquinone
Author(s) -
Ito Hiroyuki,
Nakatsuji Hiroshi
Publication year - 2001
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/1096-987x(200102)22:3<265::aid-jcc1000>3.0.co;2-4
Subject(s) - photosynthetic reaction centre , chemistry , electron transfer , photosynthesis , electron transport chain , chromophore , ab initio , rhodopseudomonas , quantum chemical , photochemistry , stereochemistry , molecule , organic chemistry , biochemistry
The electron transfer (ET) from bacteriopheophytin (H) to ubiquinone (UQ) in the photosynthetic reaction center (PSRC) of Rhodopseudomonas (Rps.) viridis was studied by ab initio quantum‐chemical calculations. The ET from the H in L‐region (H L ) to menaquinone (MQ) occurs through the super‐exchange mechanism using Trp M250 as a bridge, while in the M‐region Leu L189 works as a bridge in the ET from H M to UQ. The transfer integral for the L‐branch was 20 times larger than that for the M‐branch, which was due to the difference in the amino acid residues placed between the chromophores. For the ET from MQ to UQ, the super‐exchange mechanism using His M217 and His L190 as two subsequent bridges was by far the largest, showing the importance of these residues in the ET between MQ and UQ. © 2001 John Wiley & Sons, Inc. J Comput Chem 22: 265–272, 2001