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Lateral Distribution of the Cytochrome b₆/f and Coupling Factor ATP Synthetase Complexes of Chloroplast Thylakoid Membranes ¹

Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado, 80309

We have visualized directly the distribution of the cytochrome b₆/f and coupling factor ATP synthetase complexes in thylakoid membranes of embedded, thin-sectioned, intact chloroplasts by using rabbit antibodies directed against each complex, followed by ferritin-conjugated goat anti- (rabbit immunoglobulin G) antibodies. The labeling patterns indicate that in spinach (Spinacia oleracea) chloroplasts the cytochrome b₆/f complex is distributed laterally throughout both stacked grana and unstacked stroma membrane regions, whereas the coupling factor ATP synthetase complex is found exclusively in stroma thylakoids and in the marginal and end membranes of grana.

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