Thermodynamically accurate modeling of the catalytic cycle of photosynthetic oxygen evolution: A mathematical solution to asymmetric Markov chains

被引:28
作者
Vinyard, David J. [1 ,2 ,3 ]
Zachary, Chase E. [3 ]
Ananyev, Gennady [1 ,2 ]
Dismukes, G. Charles [1 ,2 ]
机构
[1] Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA
[2] Rutgers State Univ, Waksman Inst Microbiol, Piscataway, NJ 08854 USA
[3] Princeton Univ, Dept Chem, Princeton, NJ 08540 USA
来源
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS | 2013年 / 1827卷 / 07期
基金
美国国家科学基金会;
关键词
Photosystem II; Photosynthetic efficiency; Oxygen evolution; Markov chain; Kok model; PHOTOSYSTEM-II; O2; EVOLUTION; COOPERATION; CHARGES;
D O I
10.1016/j.bbabio.2013.04.008
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Forty-three years ago, Kok and coworkers introduced a phenomenological model describing period-four oscillations in O-2 flash yields during photosynthetic water oxidation (WOC), which had been first reported by Joliot and coworkers. The original two-parameter Kok model was subsequently extended in its level of complexity to better simulate diverse data sets, including intact cells and isolated PSII-WOCs, but at the expense of introducing physically unrealistic assumptions necessary to enable numerical solutions. To date, analytical solutions have been found only for symmetric Kok models (inefficiencies are equally probable for all intermediates, called "S-states"). However, it is widely accepted that S-state reaction steps are not identical and some are not reversible (by thermodynamic restraints) thereby causing asymmetric cycles. We have developed a mathematically more rigorous foundation that eliminates unphysical assumptions known to be in conflict with experiments and adopts a new experimental constraint on solutions. This new algorithm termed STEAMM for S-state Transition Eigenvalues of Asymmetric Markov Models enables solutions to models having fewer adjustable parameters and uses automated fitting to experimental data sets, yielding higher accuracy and precision than the classic Kok or extended Kok models. This new tool provides a general mathematical framework for analyzing damped oscillations arising from any cycle period using any appropriate Markov model, regardless of symmetry. We illustrate applications of STEAMM that better describe the intrinsic inefficiencies for photon-to-charge conversion within PSII-WOCs that are responsible for damped period-four and period-two oscillations of flash O-2 yields across diverse species, while using simpler Markov models free from unrealistic assumptions. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:861 / 868
页数:8
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