Spin-Density Distribution, Conformation, and Hydrogen Bonding of the Redox-Active Tyrosine YZ in Photosystem II from Multiple-Electron Magnetic-Resonance Spectroscopies: Implications for Photosynthetic Oxygen Evolution

1995 ◽  
Vol 117 (41) ◽  
pp. 10325-10335 ◽  
Author(s):  
Cecilia Tommos ◽  
Xiao-Song Tang ◽  
Kurt Warncke ◽  
Curtis W. Hoganson ◽  
Stenbjoern Styring ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Photosystem Ii ◽  
Density Distribution ◽  
Spin Density ◽  
Oxygen Evolution ◽  
Spin Density Distribution ◽  
Photosynthetic Oxygen Evolution ◽  
Redox Active ◽  
Photosynthetic Oxygen

Interaction of polyamines with proteins of photosystem II: Cation binding and photosynthetic oxygen evolution

2007 ◽  
Vol 833 (1-3) ◽  
pp. 169-174 ◽  
Author(s):  
R. Beauchemin ◽  
J. Harnois ◽  
R. Rouillon ◽  
H.A. Tajmir-Riahi ◽  
R. Carpentier
Keyword(s):  
Photosystem Ii ◽  
Oxygen Evolution ◽  
Cation Binding ◽  
Photosynthetic Oxygen Evolution ◽  
Photosynthetic Oxygen

Cyclic Electron Flow Around Photosystem II as Examined by Photosynthetic Oxygen Evolution Induced by Short Light Flashes

1997 ◽  
Vol 52 (3-4) ◽  
pp. 175-179 ◽  
Author(s):  
W. I. Gruszecki ◽  
K. Strzałka ◽  
A. Radunz ◽  
G. H. Schmid
Keyword(s):  
Photosystem Ii ◽  
Oxygen Evolution ◽  
Molecular Mechanisms ◽  
Electron Flow ◽  
Red Light ◽  
Cyclic Electron Flow ◽  
Photosynthetic Oxygen Evolution ◽  
Absorption Region ◽  
Photosynthetic Oxygen ◽  
Light Flashes

Abstract Photosynthetic oxygen evolution from photosystem II particles was analyzed as consequence of a train of short (5 μs) flashes of different light quality and different intensities to study cyclic electron flow around photosystem II. Damped oscillations of the amplitudes of O2-evolution corresponding to a flash sequence were fitted numerically and analyzed in terms of a nonhomogeneous distribution of misses, represented by the probability parameter αi. Application of red light, known to promote cyclic electron flow around photosystem II (Gruszecki et al., 1995) results in a considerable increase of all αi, indicating that at the molecular level the misses may be interpreted as resulting from a competition for the reduction of oxidized P680 between cyclic electron flow and the electron flow coming from the water splitting enzyme. In accordance with previous findings, application of light flashes of the spectrum covering the absorption region of carotenoids resulted in an inhibition of cyclic electron flow and a pronounced decrease of the level of the miss parameter. Possible molecular mechanisms for the activity control of this cyclic electron transport around photosystem II by carotenoids are discussed.

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