By Efraim Racker
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Extra info for A New Look at Mechanisms in Bioenergetics
This is in contrast to the partially depleted EDTA-chloroplasts or the subchloroplast particles 40 2. Photophosphorylation prepared in the presence of phospholipids. On addition of CF! to silicotungstate-treated particles, both morphological and functional restoration were achieved. However, the rates of the restored photophosphorylation were considerably lower than in reconstituted EDTA-particles. Moreover, as in the case of mitochondrial STA-particles, electron transport functions of the treated chloroplast particles were damaged also.
Fig. 2-6 The asymmetric organization of the oxidation chain in chloroplasts. In the primary p h o t o event, which releases t w o protons, t w o unidentified components Ζ and Q (presumably a quinone) are believed to participate. 42 2. Photophosphorylation Having dealt until now with phenomena that can be observed with either chloroplasts or mitochondria, I should like to use the last part of the lecture to point to some interesting differences in the bioenergetics of these two organelles. As mentioned earlier, unlike mitochondria which move protons out, chloroplasts take protons up.
Addition of plastocyanin externally to these deficient subchloro- Asymmetrie Assembly of the Chloroplast Membrane 41 plast particles stimulated electron flow to photosystem I (Hauska et al, 1970), but again no phosphorylation was associated with this process. However, when sonication was performed in the presence of an excess plastocyanin, the resulting particles catalyzed photophosphorylation at a rate close to that of the untreated control (Hauska et al, 1971 ; Racker et al, 1972). Experiments with antibodies against plastocyanin, cytochrome / and purified preparations of P-700 have led us to conclude that the electron transport components of the chloroplast membrane are organized asymmetrically just like those of the mitochondria as shown in Fig.