Orientation of the Tetranuclear Manganese Cluster and Tyrosine Z in the O2-Evolving Complex of Photosystem II:  An EPR Study of the S2YZ•State in Oriented Acetate-Inhibited Photosystem II Membranes†

Biochemistry ◽  
1999 ◽  
Vol 38 (39) ◽  
pp. 12758-12767 ◽  
Author(s):  
K. V. Lakshmi ◽  
Sandra S. Eaton ◽  
Gareth R. Eaton ◽  
Gary W. Brudvig
Keyword(s):  
Photosystem Ii ◽  
Manganese Cluster ◽  
Tyrosine Z

scholarly journals Water oxidation chemistry of photosystem II

2002 ◽  
Vol 357 (1426) ◽  
pp. 1395-1405 ◽  
Author(s):  
John S. Vrettos ◽  
Gary W. Brudvig
Keyword(s):  
Photosystem Ii ◽  
Water Oxidation ◽  
Ion Selectivity ◽  
Bound Water ◽  
Nucleophilic Attack ◽  
Manganese Cluster ◽  
Bond Forming ◽  
Proton Coupled Electron Transfer ◽  
Tyrosine Z ◽  
Oxidation Chemistry

The O 2 –evolving complex of photosystem II catalyses the light–driven four–electron oxidation of water to dioxygen in photosynthesis. In this article, the steps leading to photosynthetic O 2 evolution are discussed. Emphasis is given to the proton–coupled electron–transfer steps involved in oxidation of the manganese cluster by oxidized tyrosine Z (Y Z ), the function of Ca 2+ and the mechanism by which water is activated for formation of an O–O bond. Based on a consideration of the biophysical studies of photosystem II and inorganic manganese model chemistry, a mechanism for photosynthetic O 2 evolution is presented in which the O–O bond–forming step occurs via nucleophilic attack on an electron–deficient Mn V =O species by a calcium–bound water molecule. The proposed mechanism includes specific roles for the tetranuclear manganese cluster, calcium, chloride, Y Z and His190 of the D1 polypeptide. Recent studies of the ion selectivity of the calcium site in the O 2 –evolving complex and of a functional inorganic manganese model system that test key aspects of this mechanism are also discussed.

Ligand Environment of the S2State of Photosystem II: A Study of the Hyperfine Interactions of the Tetranuclear Manganese Cluster by 2D14N HYSCORE Spectroscopy

2010 ◽  
Vol 114 (33) ◽  
pp. 10905-10911 ◽  
Author(s):  
Sergey Milikisiyants ◽  
Ruchira Chatterjee ◽  
Amanda Weyers ◽  
Ashley Meenaghan ◽  
Christopher Coates ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Hyperfine Interactions ◽  
Manganese Cluster ◽  
Ligand Environment

The EPR Spectrum of Tyrosine Z•and Its Decay Kinetics in O2-Evolving Photosystem II Preparations†

Biochemistry ◽  
2008 ◽  
Vol 47 (24) ◽  
pp. 6292-6300 ◽  
Author(s):  
Nikolaos Ioannidis ◽  
Georgia Zahariou ◽  
Vasili Petrouleas
Keyword(s):  
Photosystem Ii ◽  
Decay Kinetics ◽  
Epr Spectrum ◽  
Tyrosine Z

Multifrequency High-Field EPR Study of the Interaction between the Tyrosyl Z Radical and the Manganese Cluster in Plant Photosystem II

1999 ◽  
Vol 103 (49) ◽  
pp. 10945-10954 ◽  
Author(s):  
Pierre Dorlet ◽  
Alain Boussac ◽  
A. William Rutherford ◽  
Sun Un
Keyword(s):  
Photosystem Ii ◽  
High Field ◽  
Manganese Cluster

245 GHz High-Field EPR Study of Tyrosine-D° and Tyrosine-Z° in Mutants of Photosystem II†

Biochemistry ◽  
1996 ◽  
Vol 35 (3) ◽  
pp. 679-684 ◽  
Author(s):  
Sun Un ◽  
Xiao-Song Tang ◽  
Bruce A. Diner
Keyword(s):  
Photosystem Ii ◽  
High Field ◽  
Tyrosine Z ◽  
Tyrosine D

scholarly journals Interaction of methanol with the oxygen-evolving complex: atomistic models, channel identification, species dependence, and mechanistic implications

2016 ◽  
Vol 7 (10) ◽  
pp. 6463-6476 ◽  
Author(s):  
Marius Retegan ◽  
Dimitrios A. Pantazis
Keyword(s):  
Photosystem Ii ◽  
Active Site ◽  
Quantum Chemical ◽  
Oxygen Evolving Complex ◽  
Manganese Cluster ◽  
Channel Identification ◽  
Atomistic Models ◽  
Chemical Studies ◽  
Quantum Chemical Studies ◽  
Oxygen Evolving

Spectroscopy-oriented quantum chemical studies establish how methanol is delivered to the water-oxidizing active site of Photosystem II and how it interacts with the manganese cluster.

Histidine 332 of the D1 Polypeptide Modulates the Magnetic and Redox Properties of the Manganese Cluster and Tyrosine YZin Photosystem II†

Biochemistry ◽  
2000 ◽  
Vol 39 (2) ◽  
pp. 470-478 ◽  
Author(s):  
Richard J. Debus ◽  
Kristy A. Campbell ◽  
Jeffrey M. Peloquin ◽  
Donna P. Pham ◽  
R. David Britt
Keyword(s):  
Photosystem Ii ◽  
Redox Properties ◽  
Manganese Cluster ◽  
D1 Polypeptide

scholarly journals Ligation of D1-His332 and D1-Asp170 to the Manganese Cluster of Photosystem II fromSynechocystisAssessed by Multifrequency Pulse EPR Spectroscopy†

Biochemistry ◽  
2011 ◽  
Vol 50 (34) ◽  
pp. 7390-7404 ◽  
Author(s):  
Troy A. Stich ◽  
Gregory J. Yeagle ◽  
Rachel J. Service ◽  
Richard J. Debus ◽  
R. David Britt
Keyword(s):  
Photosystem Ii ◽  
Epr Spectroscopy ◽  
Manganese Cluster ◽  
Pulse Epr
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