Manganese Clusters with Relevance to Photosystem II

Mukhopadhyay, Soumik; Mandal, Sanjay K.; Bhaduri, Sumit; Armstrong, William H.

doi:10.1021/cr0206014

Cited by 559 publications

(510 citation statements)

References 403 publications

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“…Also, the bidentate carboxylate bridging between Mn ions frequently is found in binuclear Mn sites in proteins (Crowley et al 2000) as well as in numerous synthetic complexes (Mukhopadhyay et al 2004). …”

Section: IVmentioning

confidence: 99%

On the structure of the manganese complex of photosystem II: extended-range EXAFS data and specific atomic-resolution models for four S-states

Dau

Grundmeier

Loja

et al. 2007

Phil. Trans. R. Soc. B

172

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The water-oxidizing manganese complex bound to the proteins of photosystem II (PSII) was studied by X-ray absorption spectroscopy on PSII membrane particles. An extended range for collection of extended X-ray absorption fine-structure (EXAFS) data was used (up to 16.6 Å K1 ). The EXAFS suggests the presence of two Mn-Mn distances close to 2.7 Å (per Mn 4 Ca complex); the existence of a third Mn-Mn distance below 2.9 Å is at least uncertain. Interestingly, a distance of 3.7 Å is clearly resolved in the extended-range data and tentatively assigned to a Mn-Mn distance. Taking into account the above EXAFS results (inter alia), we present a model for the structure of the PSII manganese complex, which differs from previous atomic-resolution models. Emphasizing the hypothetical character, we propose for all semi-stable S-states: (i) a structure of the Mn 4 Ca(m-O) n core, (ii) a model of the amino acid environment, and (iii) assignments of distinct Mn oxidation states to all the individual Mn ions. This specific working model may permit discussion, verification and invalidation of its various features in comparison with experimental and theoretical findings.

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Section: IVmentioning

confidence: 99%

On the structure of the manganese complex of photosystem II: extended-range EXAFS data and specific atomic-resolution models for four S-states

Dau

Grundmeier

Loja

et al. 2007

Phil. Trans. R. Soc. B

172

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“…Inorganic chemists have synthesized molecules, determined their structure by X-ray diffraction and characterized the oxidation state using optical absorption, EPR or magnetic susceptibility [8]. Bi-, tri, and tetra-nuclear Mn complexes have been particularly valuable for interpreting the XAS of the OEC.…”

Section: X-ray Absorption Spectroscopy (Xas)mentioning

confidence: 99%

X-ray spectroscopy of the photosynthetic oxygen-evolving complex

Sauer

Yano

Yachandra

2008

Coordination Chemistry Reviews

134

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Water oxidation to dioxygen in photosynthesis is catalyzed by a Mn 4 Ca cluster with O bridging in Photosystem II (PS II) of plants, algae and cyanobacteria. A variety of spectroscopic methods have been applied to analyzing the participation of the complex. X-ray spectroscopy is particularly useful because it is element-specific, and because it can reveal important structural features of the complex with high accuracy and identify the participation of Mn in the redox chemistry. Following a brief history of the application of X-ray spectroscopy to PS II, an overview of newer results will be presented and a description of the present state of our knowledge based on this approach.

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“…Mention will be made both of biological systems and heterogeneous systems where appropriate, but these are not the focus of this review. A number of related reviews [15][16][17][18][19][20][21][22] have appeared.…”

Section: Introductionmentioning

confidence: 99%

Functional models for the oxygen-evolving complex of photosystem II

Cady

Crabtree

Brudvig

2008

Coordination Chemistry Reviews

388

255

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In the last ten years, a number of advances have been made in the study of the oxygen-evolving complex (OEC) of photosystem II (PSII). Along with this new understanding of the natural system has come rapid advance in chemical models of this system. The advance of PSII model chemistry is seen most strikingly in the area of functional models where the few known systems available when this topic was last reviewed has grown into two families of model systems. In concert with this work, numerous mechanistic proposals for photosynthetic water oxidation have been proposed. Here, we review the recent efforts in functional model chemistry of the oxygen-evolving complex of photosystem II.

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Manganese Clusters with Relevance to Photosystem II

Cited by 559 publications

References 403 publications

On the structure of the manganese complex of photosystem II: extended-range EXAFS data and specific atomic-resolution models for four S-states

On the structure of the manganese complex of photosystem II: extended-range EXAFS data and specific atomic-resolution models for four S-states

X-ray spectroscopy of the photosynthetic oxygen-evolving complex

Functional models for the oxygen-evolving complex of photosystem II

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