Estimation of the driving force for dioxygen formation in photosynthesis
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- 作者：Hå ; kan Nilssona ; Laurent Cournacb ; c ; Fabrice Rappaportd ; Johannes Messingera ; Johannes.Messinger@umu.se" class="auth_mail" title="E-mail the corresponding author ; Jé ; rô ; me Lavergnee ; jerome.lavergne@cea.fr" class="auth_mail" title="E-mail the corresponding author
- 关键词：DCBQ ; 2 ; 5-dichloro-benzoquinone ; FCCP ; carbonylcyanide p-trifluoromethoxy-phenylhydrazone ; FIOP ; flash-induced oxygen evolution pattern ; MIMS ; membrane-inlet mass spectrometry ; Mj ; redox state of the Mn4CaO5 cluster with j electrons less than in the S0 state ; OWIE ; Oxygen&ndash ; Water Isotope Exchange ; PPBQ ; phenyl-para benzoquinone ; PSII ; photosystem II ; PSIIcc ; photosystem II core complexes ; Si states ; redox state of the donor side of PSII (P680 ; Yz ; and Mn4CaO5) with i electrons removed relati
- 刊名：Biochimica et Biophysica Acta (BBA) - Bioenergetics
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：1857
- 期：1
- 页码：23-33
- 全文大小：942 K
文摘
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The equilibrium between the S0 and S4 states in photosystem II was studied directly.
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A lower estimate for the equilibrium constant of the S4 → S0 reaction is reported.
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A high exergonicity for O2 formation in photosystem II is demonstrated.
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A high exergonicity of the S4 → S0 step is required for kinetic efficiency of PSII.
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Product release contributes significantly to the high driving force for O2 formation.