Abstract
The spin-lattice relaxation of the tyrosine radical D . in Photosystem II particles was studied at 4.2 K in samples in which flash-induced oscillations of the oxidation state of the Mn-cluster of the oxygen evolving system were abolished by addition of ANT2P, leaving Fe 2+/Fe 3+ oscillations intact. Samples subjected to 0, 1 or 2 light-flashes all showed the same relaxation kinetics. No period-2 oscillation in the spin-lattice relaxation corresponding to the Fe 2+/Fe 3--oscillation was observed. Thus the T 1-oscillations of D . as a function of flash number in untreated samples are solely caused by the charge-oscillations of the Mn-cluster (1989, Biochim. Biophys. Acta 973, 428–442).
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