Structural and functional aspects of the MSP (PsbO) and study of its differences in thermophilic versus mesophilic organisms.
The Manganese Stabilizing Protein (MSP) of Photosystem II (PSII) is a so-called extrinsic subunit, which reversibly associates with the other membrane-bound PSII subunits. The MSP is essential for maximum rates of O(2) production under physiological conditions as stabilizes the catalytic [Mn(4)Ca] cluster, which is the site of water oxidation. The function of the MSP subunit in the PSII complex has been extensively studied in higher plants, and the structure of non-PSII associated MSP has been studied by low-resolution biophysical techniques. Recently, crystal structures of PSII from the thermophilic cyanobacterium Thermosynechococcus elongatus have resolved the MSP subunit in its PSII-associated state. However, neither any crystal structure is available yet for MSP from mesophilic organisms, higher plants or algae nor has the non-PSII associated form of MSP been crystallized. This article reviews the current understanding of the structure, dynamics, and function of MSP, with a particular focus on properties of the MSP from T. elongatus that may be attributable to the thermophilic ecology of this organism rather than being general features of MSP.
Williamson
Adele K
AK
Research School of Biological Sciences, the Australian National University, Canberra 0200, Australia. adele.williamson@anu.edu.au
D000064:Acclimatization; D000595:Amino Acid Sequence; D000458:Cyanobacteria / Q000378:metabolism*; D019143:Evolution, Molecular; D006358:Hot Temperature; D008969:Molecular Sequence Data; D045332:Photosystem II Protein Complex / Q000737:chemistry / Q000378:metabolism*; D017433:Protein Structure, Secondary; D013045:Species Specificity; D018724:Spinacia oleracea; D014867:Water / Q000378:metabolism
D045332:Photosystem II Protein Complex; C054266:photosystem II manganese-stabilizing protein; D014867:Water
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