Chemical Mechanism of Water Oxidation in Photosynthesis
Listed in
This article is not in any list yet, why not save it to one of your lists.Abstract
The mechanism of water oxidation (2H2O → 4H+ + 4e + O2) through Kok cycle in PS II during photosynthesis is under debate; especially the nature of meta-stable S4 is properly not known. Moreover all developed mechanism in that purpose does not fully explain all the invented experimental evidences about that water oxidation procedure. No one develops a single mechanism by which the theoretical logic can be adjusted with the experimental data. However the process for interchanging each other of S2A and S2B-state (two different forms of S2-state) is mechanically discussed a little in all of already developed mechanisms. The role of Ca2+, Asp61-channel, Cl--channel and Ca2+-channel (bicarbonate-ion (HCO3-)) is not completely characterized in those mechanisms till now. The entrance of actual substrate water molecules (H2O) attached with oxygen-evolving complex (OEC) in the reaction of molecular oxygen (O2) formation is not also clearly understood. Here an alternative mechanism will be proposed to remove the lack of logics in between that exact mechanism and experimental information, obtained from recent research-work.
