The Possible Relation between a Membrane Conformational Change and Photosystem II Dependent Hydrogen Ion Accumulation and Adenosine 5′-Triphosphate Synthesis

Robert T. Giaquinta, Donald R. Ort, Richard A. Dilley

Research output: Contribution to journalArticle

Abstract

Data are presented which suggest that photosystem II dependent hydrogen ion accumulation and ATP synthesis can occur only after the lamellar membranes have undergone a conformational change. This membrane conformational change is detected by the electron transport dependent incorporation of diazonium benzene[35S]sulfonate into membrane components. Previously it was established that electron flux from the photosystem II primary acceptor to plastoquinone is a necessary event for the occurrence of the diazonium-detected conformational change. These studies indicate that the release of hydrogen ions during photosystem II oxidation of the primary reductant is also a necessary event for the diazonium-detected conformational change. When iodide ions were substituted for water (or other proton-releasing donors) as the primary reductant of system II the conformational change did not occur even though a substantial rate of electron flow from the primary acceptor to plastoquinone occurred.

Original languageEnglish (US)
Pages (from-to)4392-4396
Number of pages5
JournalBiochemistry
Volume14
Issue number20
DOIs
StatePublished - Oct 1 1975

ASJC Scopus subject areas

  • Biochemistry

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