Studies on the multiphasic charge recombination between chlorophyll aII+ (P-680+) and plastoquinone QA− in photosystem II complexes. Ultraviolet difference spectrum of Chl-aII+/Chl-aII

1989 ◽  
Vol 977 (1) ◽  
pp. 52-61 ◽  
Author(s):  
S. Gerken ◽  
J.P. Dekker ◽  
E. Schlodder ◽  
H.T. Witt
Keyword(s):  
Photosystem Ii ◽  
Difference Spectrum ◽  
Charge Recombination ◽  
Plastoquinone Qa

Charge Recombination and Proton Transfer in Manganese-Depleted Photosystem II†

Biochemistry ◽  
1997 ◽  
Vol 36 (49) ◽  
pp. 15294-15302 ◽  
Author(s):  
Fabrice Rappaport ◽  
Jérôme Lavergne
Keyword(s):  
Photosystem Ii ◽  
Proton Transfer ◽  
Charge Recombination

scholarly journals Site-directed mutations at D1-His198 and D1-Thr179 of photosystem II in Synechocystis sp. PCC 6803: deciphering the spectral properties of the PSII reaction centre

2007 ◽  
Vol 363 (1494) ◽  
pp. 1197-1202 ◽  
Author(s):  
Eberhard Schlodder ◽  
William J Coleman ◽  
Peter J Nixon ◽  
Rachel O Cohen ◽  
Thomas Renger ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Difference Spectrum ◽  
Axial Ligand ◽  
Reaction Centre ◽  
Wild Type ◽  
Difference Spectra ◽  
Exciton Transition ◽  
Special Pair ◽  
First Approximation ◽  
Absorbance Difference

Site-directed mutations were constructed in photosystem II of Synechocystis sp. PCC6803 in which the axial ligand, D1-His198, of special pair chlorophyll P D1 was replaced with Gln and where D1-Thr179, which overlies monomeric chlorophyll Chl D1 , was replaced with His. The D1-His198Gln mutation produces a 3 nm displacement to the blue of the bleaching minimum in the Soret and in the Qy region of the – absorbance difference spectrum. To a first approximation, the bleaching can be assigned to the low-energy exciton transition of the special pair chlorophylls P D1 /P D2 . The D1-Thr179His mutation produces a 2 nm displacement to the red of the bleaching minimum in the Qy region of the ( 3 P– 1 P) absorbance difference spectrum. Analysis of the flash-induced – and ( 3 P– 1 P) absorbance difference spectra of both mutants compared with wild-type at 80 K indicate that the cation of the oxidized donor P + is predominantly localized on the chlorophyll P D1 of the special pair and that the reaction centre triplet state, produced upon charge recombination from 3 [P + Pheo − ], when the primary quinone electron acceptor Q A is doubly reduced, is primarily localized on Chl D1 .

Thermodynamics of the charge recombination in photosystem II

1986 ◽  
pp. 53-60
Author(s):  
H. J. Van Gorkom ◽  
R. F. Meiburg ◽  
L. J. De Vos
Keyword(s):  
Photosystem Ii ◽  
Charge Recombination
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