Methane Hydroxylation with Water as an Electron Donor under Light Irradiation in the Presence of Reconstituted Membranes Containing both Photosystem II and a Methane Monooxygenase

ChemBioChem ◽  
2018 ◽  
Vol 19 (20) ◽  
pp. 2152-2155 ◽  
Author(s):  
Hidehiro Ito ◽  
Ryuichi Kondo ◽  
Kosei Yoshimori ◽  
Toshiaki Kamachi
Keyword(s):  
Photosystem Ii ◽  
Electron Donor ◽  
Methane Monooxygenase ◽  
Light Irradiation ◽  
Reconstituted Membranes

Effect of Magnesium and Calcium Ions on the Photoelectron Transport Activity of Low-Salt Suspended Hydrilla verticillata Thylakoids: Possible Sites of Cation Interaction

1998 ◽  
Vol 53 (9-10) ◽  
pp. 849-856
Author(s):  
Sujata R. Mishra ◽  
Surendra Chandra Sabat
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Electron Donor ◽  
Water Oxidation ◽  
Electron Flow ◽  
Hydrilla Verticillata ◽  
Transport Activity ◽  
Low Salt ◽  
Electron Transport Activity ◽  
Stimulation Of

Stimulatory effect of divalent cations like calcium (Ca2+) and magnesium (Mg2+) was investigated on electron transport activity of divalent cation deficient low-salt suspended (LS) thylakoid preparation from a submerged aquatic angiosperm, Hydrilla verticillata. Both the cations stimulated electron transport activity of LS-suspended thylakoids having an intact water oxidation complex. But in hydroxylamine (NH2OH) - or alkaline Tris - washed thylakoid preparations (with the water oxidation enzyme impaired), only Ca2+ dependent stimulation of electron transport activity was found. The apparent Km of Ca2+ dependent stimulation of electron flow from H2O (endogenous) or from artificial electron donor (exogenous) to dichlorophenol indophenol (acceptor) was found to be identical. Calcium supported stimulation of electron transport activity in NH2OH - or Tris - washed thylakoids was electron donor selective, i.e., Ca2+ ion was only effective in electron flow with diphenylcarbazide but not with NH2OH as electron donor to photosystem II. A magnesium effect was observed in thylakoids having an intact water oxidation complex and the ion became unacceptable in NH2OH - or Tris - washed thylakoids. Indirect experimental evidences have been presented to suggest that Mg2+ interacts with the water oxidation complex, while the Ca2+ interaction is localized betw een Yz and reaction center of photosystem II.

An ESEEM study of the oxidized electron donor of plant photosystem II: Evidence that D is a neutral tyrosine radical

1989 ◽  
Vol 161 (6) ◽  
pp. 479-484 ◽  
Author(s):  
R.G. Evelo ◽  
A.J. Hoff ◽  
S.A. Dikanov ◽  
A.M. Tyryshkin
Keyword(s):  
Photosystem Ii ◽  
Electron Donor ◽  
Tyrosine Radical

scholarly journals Observation of a new EPR transient in chloroplasts that may reflect the electron donor to photosystem II at room temperature

FEBS Letters ◽  
1975 ◽  
Vol 51 (1-2) ◽  
pp. 287-293 ◽  
Author(s):  
Robert E. Blankenship ◽  
Gerald T. Babcock ◽  
Joseph T. Warden ◽  
Kenneth Sauer
Keyword(s):  
Photosystem Ii ◽  
Electron Donor ◽  
Room Temperature

scholarly journals Solid-State Hydrogen Fuel by PSII–Chitin Composite and Application to Biofuel Cell

2021 ◽  
Vol 5 (12) ◽  
pp. 317
Author(s):  
Yusuke Takahashi ◽  
Akinari Iwahashi ◽  
Yasumitsu Matsuo ◽  
Hinako Kawakami
Keyword(s):  
Fuel Cell ◽  
Solid State ◽  
Photosystem Ii ◽  
Characteristic Feature ◽  
Light Irradiation ◽  
Biofuel Cell ◽  
Maximum Power Density ◽  
Hydrogen Fuel ◽  
Next Generation ◽  
Energy Field

Biomaterials attract a lot of attention as next-generation materials. Especially in the energy field, fuel cells based on biomaterials can further develop clean next-generation energy and are focused on with great interest. In this study, solid-state hydrogen fuel (PSII–chitin composite) composed of the photosystem II (PSII) and hydrated chitin composite was successfully created. Moreover, a biofuel cell consisting of the electrolyte of chitin and the hydrogen fuel using the PSII–chitin composite was fabricated, and its characteristic feature was investigated. We found that proton conductivity in the PSII–chitin composite increases by light irradiation. This result indicates that protons generate in the PSII–chitin composite by light irradiation. It was also found that the biofuel cell using the PSII–chitin composite hydrogen fuel and the chitin electrolyte exhibits the maximum power density of 0.19 mW/cm2. In addition, this biofuel cell can drive an LED lamp. These results indicate that the solid-state biofuel cell based on the bioelectrolyte “chitin” and biofuel “the PSII–chitin composite” can be realized. This novel solid-state fuel cell will be helpful to the fabrication of next-generation energy.

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