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Abstract
Light induced spin-polarized P680 +Q − A radical pairs were studied by two pulse electron spin echo envelope modulation (ESEEM) spectroscopy in the cyanide-treated and Zn-substituted Photosystem II core complexes and in the isolated D1-D2-cyt b559 reaction center complexes reconstituted with dibromoisopropyl- p-benzoquinone. The observed strong out-of phase ESEEM signals were identified as those of the P680 +Q − A radical pairs based on the time variation of the transient CW EPR spectra. The shapes of ESEEM spectra were attributed to dipolar D and spin exchange J interactions in the radical pairs. The values of D and J were derived from a sine Fourier transformation and the center-to-center distance between P680 and Q A was determined to be 27.2±1.0 Å for all three preparations.
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Schedule a callMore From: Biochimica et Biophysica Acta (BBA) - Bioenergetics
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