In the process of water oxidation in photosystem II (PS II), water is split into four protons and O2 via a series of four redox steps in a catalytic site called oxygen-evolving complex (OEC), which consists of a manganese cluster and a redox-active tyrosine residue, YZ. During the assembly of PS II to its functional state, the manganese cluster of photosynthetic OEC is formed by a process called photoassembly. In this paper, based on the current research progresses, a complete introduction on the photoassembly of the manganese cluster of photosynthetic OEC was presented as follow: (1) Kinetic model for photoassembly of the manganese cluster complex OEC; (2) Proteins and external ligands related to the formation of the manganese cluster in photoassembly; (3) The binding properties of manganese in the apo-OEC-PS II; (4) Role of cofactors in photoassembly; (5) Mechanism for the photoassembly of the manganese cluster of photosynthetic OEC. In addition, the photoassembly of the manganese cluster by using synthetic manganese complex and apo-OEC-PS II was reviewed and discussed on the bases of our research results. In the end of this paper, some open questions from the present research on the structure and function of the manganese cluster of photosynthetic OEC were pointed out and the future application from this research is introduced.
Contents
1. Introduction
2. Photoassembly of manganese cluster of photosynthetic oxygen-evolving complex
2.1 Kinetic model for photoassembly of the manganese cluster complex
2.2 Proteins and external ligands related the formation of manganese cluster in photoassembly
2.3 Manganese and manganese binding with the apo-OEC-PS II in photoassembly
2.4 Role of calcium ion in photoassembly
2.5 Role of chloride ion in photoassembly
2.6 Role of bicarbonate ion in photoassembly
2.7 Role of other cofactors from PS II in photoassembly
3. Mechanism for photoassembly of manganese cluster of photosynthetic OEC
4. Photoassembly of manganese cluster by using synthetic manganese complex and apo-OEC-PS II
5. Perspectives