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  • Title: Evidence for only one iron-sulfur cluster in center X of photosystem I from higher plants.
    Author: Guigliarelli B, Guillaussier J, Bertrand P, Gayda JP, Setif P.
    Journal: J Biol Chem; 1989 Apr 15; 264(11):6025-8. PubMed ID: 2539365.
    Abstract:
    In the photosystem I of thylakoid membranes, the photoinduced electron transfer involves three iron-sulfur centers, A, B, and X. Among them, center X is characterized by very unusual spectroscopic and redox properties. Recent arguments have been presented in favor of a [2Fe-2S] structure for the clusters implicated in this center, but the number of these clusters is still a controversial question. By using an original EPR method, based on the differences in the relaxation properties of A, B, and X, we have determined the stoichiometry for the iron-sulfur clusters in photosystem I. Our measurements indicate that center X is composed of a single iron-sulfur cluster per P700. The possible implications of this result for the polypeptide composition of the core reaction center are discussed.
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