On the site of function of the Rieske iron-sulfur center in the chloroplast electron transport chain |
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Authors: | Richard Malkin Herbert B. Posner |
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Affiliation: | 1. Department of Cell Physiology, University of California, Berkeley, Calif., 94720 U.S.A.;2. Department of Biological Sciences, State University of New York at Binghamton, Binghamton, N.Y., 13901 U.S.A. |
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Abstract: | A photosynthetic mutant (strain 1073) of Lemna perpusilla was previously shown to have a block in the electron transport chain between plastoquinone and cytochrome f ((1976) Plant Physiol. 57, 577–579). Electron paramagnetic resonance analysis of chloroplasts from this mutant indicates that the g = 1.89 signal of a reduced iron-sulfur center (the ‘Rieske’ iron-sulfur center) is absent. The absence of this signal indicates the Rieske center is either absent from or defective in the mutant, and this result is consistent with this iron-sulfur center functioning between plastoquinone and cytochrome f in the electron transport chain of chloroplasts. |
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