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Showing 1 to 13 of 13 for “"oxygen evolving complex"”.
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Computational Insights Into The Oxygen Evolving Complex Of Photosystem ΙΙ
<p>The Oxygen Evolving Complex (OEC) of Photosystem II (PSII) is a unique Mn4O5Ca2+ cluster that catalyzes the photoactivated water splitting reaction. The OEC is a model system for bio-inspired artificial systems to use solar energy to pull electrons from water to produce fuel. The OEC goes …
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Characterization of tetranuclear manganese complexes and thermochromic copper(II) and nickel(II) complexes
… properties of four tetranuclear manganese complexes that are potential models for the oxygen evolving complex of photosystem II are examined. The complexes, based upon x-ray crystallography are cubane like structures containing a single manganese ion with a +4 oxidation state and three …
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Characterization of ESl47, a salt stress regulated protein kinase from Lophopyrum elongatum
… Six partial DNA sequences encoding a 33 kDa oxygen-evolving enhancer precursor protein (OEE1) from the photosystem II oxygen-evolving complex were identified which showed an interaction with the ESI47 kinase. Sequence analysis showed that the partial length OEE1 clones were missing the first …
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The Role of HSP90C in Chloroplast Maturation and Thylakoid Protein Transport
… Using a thylakoid lumen-localized subunit of the oxygen evolving complex, I demonstrated that PsbO1 is tightly regulated by the HSP90C complex in the stroma. By analyzing the chloroplast maturation process, the essential role of HSP90C and its ATPase activity in regulating and balancing the influx …
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De Novo Design And Engineering Of Functional Metal And Porphyrin-Binding Protein Domains
… e6 and hemin:Zn(II)-protoporphyrin IX complexes. These results imply that many sophisticated functions such as cofactor binding and electron transfer require only a very small number of residue positions in a protein sequence to be fixed.</p> <p>Net charge and hydrophobic content are …
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Accounting for Strong Electronic Correlation in Metalloproteins
… role in many key biological processes, from oxygen transport to photosynthesis. In the case of photosynthesis, the oxygen evolving complex (OEC) --- a CaMn\textsubscript{4}O\textsubscript{5} cluster --- catalyses water-to-oxygen-gas conversion. From a computational standpoint, accurately …
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Towards reverse engineering of Photosystem II: Synergistic Computational and Experimental Approaches
ABSTRACT Photosystem II (PSII) of oxygenic photosynthesis has the unique ability to photochemically oxidize water, extracting electrons from water to result in the evolution of oxygen gas while depositing these electrons to the rest of the photosynthetic machinery which in turn reduces CO2 to …
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Parallel instrumentational approaches to the study of the bioenergetics of photosynthesis in chloroplasts and intact plants
… of the chromophores of the cytochrome b6f complex (b6f) under a variety of redox and inhibitory conditions designed to help elucidate its function in electron transfer. These studies, were directed at settling controversies about the properties and function of the chloroplast cytochrome …
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Study on polypeptides of cyanobacterial photosystem 2
… unrelated to known polypeptides of the oxygen evolving complex, was shown to disappear on trypsin treatment, a disappearance which correlated to the loss of oxygen evolving activity. Calcium binding studies performed on Synechococcus 7942 showed the presence of a calmodulin-like calcium …
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The Mechanism of Chloride Activation of Oxygen Evolution in Spinach Photosystem Ii
… mechanism by which ${\rm Cl}\sp-$ activates the oxygen-evolving complex (OEC) of Photosystem II (PS II) was studied by $\sp{35}{\rm Cl}$-NMR and steady-state measurements of oxygen evolution. This study represents the first attempt to directly monitor ${\rm Cl}\sp-$ binding in spinach. At low …
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Bicarbonate Reversible Anionic Inhibition of the Quinone Reductase in Photosystem II
… Q$\sb{\rm A}\sp-$ and the S$\sb2$ state of the oxygen evolving complex was inhibited four-fold below pH 7.0 but was unaffected above pH 7.5 in the presence of DCMU. A HCO$\sb3\sp-$ sensitive back reaction with a half-time of $<$100 $\mu$s was observed at pH 8.0 in the presence of DCMU in …
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Spectroscopic Characterization of the Water-Oxidation Intermediates in the Ru-Based Catalysts for Artificial Photosynthesis
… such as water splitting into hydrogen and oxygen. Ruthenium complexes are among few molecular-defined catalysts capable of water splitting. Insight into the mechanism of their action will help to design future robust and economically feasible catalysts for light-to-energy conversion. …
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Rational design of functional heme copper oxidases in myoglobin
… Many, if not all, of the most important and complex processes that occur in living systems are performed by a metalloprotein. These processes include photosynthesis, cellular respiration, and nucleic acid repair. The metals in these proteins expand the potential chemistry beyond what can be …