Two-dimensional electron transfer from cytochrome C to photosynthetic reaction centers |
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Authors: | Johann Riegler Joachim Peschke Helmut Möhwald |
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Affiliation: | Physics Department (E22, Biophysics), Techn. Univ. Munich, D-8046 Garching, Germany |
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Abstract: | The arrangement and the electron transfer are studied for photosynthetic reaction centers (RC) of Rhodopseudomonas sphaeroides reconstituted into phospholipid vesicles. Freeze-etch electron micrographs of phase separated mixed vesicles reveal an RC enrichment in the phase containing the acidic lipid serine. It is demonstrated that the electron transfer from cytochrome c to RC involves a two-dimensional diffusion of the membrane bound electron donor with diffusion coefficients (D approximately 10(-9) cm2/sec) characteristic for membrane proteins. |
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