Enthalpy, Entropy, and Volume Changes of Electron Transfer Reactions in Photosynthetic Proteins

Hou, Harvey J. M.

doi:10.5772/13147

Cited by 1 publication

(2 citation statements)

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“…Further difficulty is given by the temperature dependence of the thermodynamic parameters. There are clear examples showing that entropy plays an important role in some of the photosynthetic ET or charge recombination steps in different systems [42,43]. Further, part of the energy which is not used for photochemistry and will be dissipated as heat, might induce structural changes (cf.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…The change in the molecular structure which results in sudden change in the molecular volume (expansion or shrinkage) is a marker of the photoactivity and can be detected directly in a time resolved manner [71,75,88–90]. As pointed out above, this technique provided evidence for different light-induced volume changes / reorganizations in different photochemical RCs and is suitable to deliver quantitative thermodynamic parameters, such as enthalpy, entropy and volume changes, of the light-induced structural changes (reviewed by Hou [42]).…”

Section: Conformational Changesmentioning

confidence: 99%

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Light-induced reversible reorganizations in closed Type II reaction centre complexes: physiological roles and physical mechanisms

et al. 2022

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The purpose of this review is to outline our understanding of the nature, mechanism and physiological significance of light-induced reversible reorganizations in closed Type II reaction centre (RC) complexes. In the so-called ‘closed' state, purple bacterial RC (bRC) and photosystem II (PSII) RC complexes are incapable of generating additional stable charge separation. Yet, upon continued excitation they display well-discernible changes in their photophysical and photochemical parameters. Substantial stabilization of their charge-separated states has been thoroughly documented—uncovering light-induced reorganizations in closed RCs and revealing their physiological importance in gradually optimizing the operation of the photosynthetic machinery during the dark-to-light transition. A range of subtle light-induced conformational changes has indeed been detected experimentally in different laboratories using different bRC and PSII-containing preparations. In general, the presently available data strongly suggest similar structural dynamics of closed bRC and PSII RC complexes, and similar physical mechanisms, in which dielectric relaxation processes and structural memory effects of proteins are proposed to play important roles.

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Section: Theoretical Backgroundmentioning

confidence: 99%