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• W2034143163 abstract "Abstract 1. 1. Chromatophores from Rhodospirillum rubrum were used to study the photosynthetic formation of ATP in relation to ATP-P 1 exchange, ADP-ATP exchange and ATPase. 2. 2. ATP-P 1 exchange was greatly stimulated by light (approx. 1000 ft-candles). Ascorbate affected the ATP-P 1 exchange activity in light in a similar manner to the photophosphorylating activity, both activities being greateest in the presence of 67 mM ascorbate. 3. 3. ADP-ATP exchange in light was stimulated more by PMS than by ascorbate. For both light ADP-ATP exchange and photophosphorylation, the optimal concentration of PMS was approx. 0.4 mM. 4. 4. In the presence of 3.3 mM ATP, ATPase activities in light and dark were depressed by the presence of more than 5 mM ascorbate. The inhibition by ascorbate was competitive with the neutralization caused by a high concentration of ATP. 5. 5. Photophosphorylation and ATP-P 1 and ADP-ATP exchange in light and dark were maximal at around pH 8, whereas ATPase activities in light and dark were maximal at pH 8.5 or more. 6. 6. Photophosphorylation activity and ATP-P i exchange and ATPase activity in light and dark were inactivated by prolonged sonication of the chromatophores. However, with prolonged sonication ADP-ATP exchanges with ascorbate in light and dark and with PMS in dark increased in activity, whereas ADP-ATP exchange with PMS in light was scarcely affected. 7. 7. ATPase activity was significantly stimulated by arsenate, 2,4-dinitrophenol and pyrophosphate, and depressed by quinacrine hydrochloride and quinine hydrochloride, even in the presence of arsenate and 2,4-dinitrophenol. 8. 8. ATP-P i and ADP-ATP exchange, which are induced by light in the presence of PMS (“in light” minus “in dark”: light-induced), were inhibited by quinacrine hydrochloride and 2,4-dinitrophenol to almost the same extent as photophosphorylation. 9. 9. ATP-P i exchange in dark was significantly inhibited by arsenate, quinacrine hydrochloride, quinine hydrochloride and 2,4-dinitrophenol, but ADP-ATP exchange in dark was not. The latter was markedly inhibited by pyrophosphate. 10. 10. Light-induced ATP-P i exchange with PMS was less inhibited by o -phenanthroline than photophosphorylation with PMS; in the presence of 0.67 mM o -phenanthroline, these two reactions were inhibited 10% and 48%, respectively. 11. 11. Photophosphorylation with ascorbate and light-induced ATP-P i exchange with ascorbate were inhibited by more than 1·10 −3 μg/ml of antimycin A. The minimal concentration required for complete inhibition was approx. 3.3·10 −2 μg/ml. In the presence of lower concentrations of antimycin A, light-induced ATP-P i exchange was inhibited less than photophosphorylation. 12. 12. From these findings, the roles of ATP-P i exchange, ADP-ATP exchange and ATPase activity are discussed in relation to the photosynthetic formation of ATP." @default.
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• W2034143163 date "1965-03-01" @default.
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• W2034143163 title "Possible partial reactions of the photophosphorylation process in chromatophores from Rhodospirillum rubrum" @default.
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• W2034143163 doi "https://doi.org/10.1016/0926-6585(65)90045-2" @default.
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