Abstract
The decay of tyrosine cation radical was found to be biphasic at 253 K. The fast phase corresponds to the YZ • component while the slow phase corresponds to the tyrosine D radical (YD •) component. At 253 K, the t1/2 value was ∼28.6 s for the fast phase and ∼190.7 s for the slow phase. The fast phase is attributed to the recombination of charges between YZ • and QA −. The activation energy for the reaction of YZ with QA − between 253 and 293 K was 48 kJ mol−1 in Cl−-depleted photosystem 2 (PS2) membranes. Both the decay rate and the amplitude of the PAR -induced signal of YZ • were affected by addition of chloride anion. Change in the decay rate and the amplitude of the PAR-induced signal of YZ • was observed when other anions like Br−, I−, F, HCO3 −, NO3 −, PO4 3− were substituted in the Cl−-depleted PS2.
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Jajoo, A., Bharti, S. & Kawamori, A. Decay Kinetics of Tyrosine Radical (YZ •) in Chloride Anion-Depleted Photosystem 2 Studied by Time-Resolved EPR. Photosynthetica 42, 59–64 (2004). https://doi.org/10.1023/B:PHOT.0000040570.39971.63
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DOI: https://doi.org/10.1023/B:PHOT.0000040570.39971.63