Uncouplers can shuttle between localized energy-coupling sites during photophosphorylation by chromatophores of Rhodopseudomonas capsulata

Two models of the action of uncoupler molecules in inhibiting photophosphorylation in bacterial chromatophores are considered: either uncoupler molecules shuttle rapidly between energy-coupling sites, or uncoupler molecules that are bound to particular sites in the chromatophores may uncouple by a c...

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Veröffentlicht in:Biochemical journal 1983-01, Vol.212 (1), p.25-30
Hauptverfasser: Hitchens, G D, Kell, D B
Format: Artikel
Sprache:eng
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Zusammenfassung:Two models of the action of uncoupler molecules in inhibiting photophosphorylation in bacterial chromatophores are considered: either uncoupler molecules shuttle rapidly between energy-coupling sites, or uncoupler molecules that are bound to particular sites in the chromatophores may uncouple by a co-operative "substoichiometric" mechanism. The results indicate that uncoupler molecules shuttle rapidly between energy-coupling sites and is consistent both with models of energy coupling in which the energized intermediate between electron transport and phosphorylation is delocalized over the entire chromatophore membrane and those in which it is not.
ISSN:0264-6021