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Low temperature EPR results from Photosystem I (PS I) single crystals of Synechococcus elongatus are presented. Illumination at 150 K and pH 6.4 is used to photoreduce the two terminal 4Fe-4S centers to the noninteracting state (F -A ) + (F -B ). From the EPR data and the analysis of the rotation pattern for both F -A and F -B the following information...
In Photosystem I (PS I) the terminal electron acceptors, F A and F B , are iron-sulfur (4Fe-4S) centers, which are bound to the stromal subunit PsaC. The orientation of PsaC is determined relative to the whole PS I complex (see Schubert, W.-D. et al. (1995) in From Light to Biosphere (Mathis, P. ed.), Vol. II, pp. 3-10, Kluwer) from which a molecular model for the structure of PsaC...
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