Open AccessModel for primary charge separation in reaction centers of photosynthetic bacteria
Author(s) -
Richard A. Friesner,
Reiner Wertheimer
Publication year - 1982
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.79.6.2138
Subject(s) - photosynthetic reaction centre , electron transfer , photosynthesis , resonance (particle physics) , mixing (physics) , physics , chemistry , chemical physics , coupling (piping) , atomic physics , materials science , quantum mechanics , biochemistry , metallurgy
We present model calculations of the dynamics of primary electron transfer (ET) in reaction centers of photosynthetic bacteria. We obtain half times of [unk]1 ps and ≈5 ps for the first two ET processes, in excellent agreement with experimental observations. Our model is based on (i ) a theoretical framework capable of describing ET in the presence of strong electronic interstate resonance coupling and (ii ) energy parameters extracted from recent experimental data and molecular orbital calculations. Our analysis suggests that (i ) strong electronic interstate mixing is crucial to the rapidity and efficiency of irreversible ET; (ii ) possibly five rather than three electronic states participate in the transient ET prior to the reductionin vivo of the quinone complex; and (iii ) conventional ET theories, which rely on weak electronic interstate mixing, are unfit for describing ET in reaction centers of photosynthetic bacteria.