Photodamage to the oxygen evolving complex of photosystem II by visible light

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چکیده

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Photodamage to the oxygen evolving complex of photosystem II by visible light

Light damages photosynthetic machinery, primarily photosystem II (PSII), and it results in photoinhibition. A new photodamage model, the two-step photodamage model, suggests that photodamage to PSII initially occurs at the oxygen evolving complex (OEC) by light energy absorbed by manganese and that the PSII reaction center is subsequently damaged by light energy absorbed by photosynthetic pigme...

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Crystal structure of the oxygen-evolving complex of photosystem II.

The oxygen in our atmosphere is derived from and maintained by the water-splitting process of photosynthesis. The enzyme that facilitates this reaction and therefore underpins virtually all life on our planet is known as photosystem II (PSII). It is a multisubunit enzyme embedded in the lipid environment of the thylakoid membranes of plants, algae, and cyanobacteria. Powered by light, PSII cata...

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Oxygen evolving complex in photosystem II: better than excellent.

The Oxygen Evolving Complex in photosystem II, which is responsible for the oxidation of water to oxygen in plants, algae and cyanobacteria, contains a cluster of one calcium and four manganese atoms. This cluster serves as a model for the splitting of water by energy obtained from sunlight. The recent published data on the mechanism and the structure of photosystem II provide a detailed archit...

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CI-NMR measurement of chloride binding to the oxygen-evolving complex of spinach Photosystem II

The mechanism by which CIactivates the oxygen-evolving complex (OEC) of Photosystem II (PS II) in spinach was studied by 3SCI-NMR spectroscopy and steady-state measurements of oxygen evolution. Measurements of the excess 35Cl-NMR linewidth in dark-adapted, CI--depleted thylakoid and Photosystem I1 membranes show an overall hyperbolic decrease which is interrupted by sharp increases in linewidth...

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High-spin Mn-oxo complexes and their relevance to the oxygen-evolving complex within photosystem II.

The structural and electronic properties of a series of manganese complexes with terminal oxido ligands are described. The complexes span three different oxidation states at the manganese center (III-V), have similar molecular structures, and contain intramolecular hydrogen-bonding networks surrounding the Mn-oxo unit. Structural studies using X-ray absorption methods indicated that each comple...

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ژورنال

عنوان ژورنال: Scientific Reports

سال: 2015

ISSN: 2045-2322

DOI: 10.1038/srep16363