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Calcium in the oxygen-evolving complex: Structural and mechanistic role determined by X-ray spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
29611 44425 2011 9 PDF Available
Title
Calcium in the oxygen-evolving complex: Structural and mechanistic role determined by X-ray spectroscopy
Abstract

This review describes the results from X-ray Absorption Spectroscopy studies that have contributed to an understanding of the role of Ca in the photosynthetic water-oxidation reaction. The results include the first Mn, Ca and Sr X-ray spectroscopy studies using Ca or Sr-substituted PS II samples that established the presence of a MnCa heteronuclear structure and its orientation, and the most recent Sr X-ray spectroscopy study using biosynthetically prepared Sr-containing PS II in the various S-states that provide important insights into the requirement for Ca in the mechanism of the Mn4Ca catalytic center.

► X-ray spectroscopy confirms the presence of a heteronuclear Mn4Ca cluster. ► Sr XAS is used to determine the orientation of Ca/Sr–Mn vectors in the membrane. ► XAS determines the Mn4Ca cluster structural changes in all the intermediate states. ► The mechanistic requirement for Ca for the water-oxidation reaction is discussed.

Keywords
Manganese; Calcium; Oxygen-evolving complex; Photosystem II; X-ray Absorption Spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 104, Issues 1–2, July–August 2011, Pages 51–59
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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