Possible Mechanisms of Water Binding to the Oxygen-Evolving Complex during the S4-S0 Transition: A Theoretical Investigation
Received date: 2017-05-16
Online published: 2017-09-04
Supported by
Project supported by the National Natural Science Foundation of China (Nos. 21473083, 21133005) and the Natural Science Foundation of Liaoning Province (No. 2014020150).
It has been acknowledged that molecular oxygen produced in photosynthesis originates from water, rather than carbon dioxide. Dioxygen releases in the S4-S0 transition immediately prior to a new water binding to the oxygen-evolving complex, but hardly any investigation has been carried out on the binding mechanism up to date. Based on the open-cubane oxo-oxyl coupling mechanism in the S4 state of photosynthetic oxygen evolution, in this study we propose three possible pathways of water binding to the oxygen-evolving complex Mn4CaO4 during the S4-S0 transition, i.e. water binding to Ca trans to O5, water binding to Ca cis to O5, and water binding to Mn4 trans to O5. Broken-symmetry density functional theory (BS-DFT) calculations have demonstrated the thermodynamic feasibility for all these possible modes, without an overwhelming inclination for a certain manner. Besides, all these styles do not bring about any difference embodied in the experimental kinetic data on substrate water exchange in the S1, S2 and S3 states, for the basically same structures of the S0 state derived from these different routes. Therefore, it is considered that the alternative mechanisms could coexist coordinately in the connecting stage between S-state cycles. Importantly, diverse forms of substrate selectivity are deduced according to different water binding ways, which exert obvious influences on the present and later S-cycles. In the long run, however, it can be seen that the two waters binding in the S4-S0 and S2-S3 periods together constitute the components of the released O2. What matters is variation of the time to become substrates for different water binding modes during the S4-S0 transition, either in the current cycle or in the following cycles. Meanwhile, it is indicated that the dangler Mn4(Ⅲ)/(IV) which possesses a five-coordinated pyramidal ligand field in both S'0-S'3 states, along with Ca(Ⅱ) on which the carrousel rearrangement of water ligands can also occur, are essential structural elements of the S-state advancement and oxygen evolution. Thus, Mn4 and Ca may be in charge of water delivery to the active sites of Mn4CaO5 from the nearby external water channels formed by crystal waters in hydrogen-bond interactions. On the whole, the geometric flexibility of the Mn cluster plays an important role in photosynthetic water oxidation. In the respects of water binding modes in the S4-S0 transition and corresponding substrate identifications for a specific S-cycle, we are looking forward to further confirmations or supplements from the experimental evidences of the targeted isotope labeling combined with mass spectrometry, infrared spectroscopy and site directed mutagenesis, etc. Our investigation may provide useful information and references for the mechanistic elucidations on photosynthetic water oxidation, especially in substrate water identifications.
Guo Yu , Liu Yu , Qi Juanjuan , Li Hui , He Lanlan , Lu Linan , Liu Cui , Gong Lidong , Zhao Dongxia , Yang Zhongzhi . Possible Mechanisms of Water Binding to the Oxygen-Evolving Complex during the S4-S0 Transition: A Theoretical Investigation[J]. Acta Chimica Sinica, 2017 , 75(9) : 914 -921 . DOI: 10.6023/A17050214
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