Reevaluation of the stoichiometry of cytochrome b559 in photosystem II and thylakoid membranes

Carolyn A. Buser, Bruce A. Diner, Gary W. Brudvig

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

The stoichiometry of cytochrome b559 (one or two copies) per reaction center of photosystem II (PSII) has been the subject of considerable debate. The molar ratio of cytochrome b559 has a number of significant implications on our understanding of the functional role of cytochrome b559, the mechanism of electron donation in PSII, and the stoichiometry of the other redox-active, reaction center components. We have reinvestigated the stoichiometry of cytochrome b559 in PSII-enriched and thylakoid membranes, using differential absorbance and electron paramagnetic resonance spectroscopies. The data from both quantitation procedures strongly indicate only one copy of cytochrome b559 per reaction center in PSII-enriched membranes and also suggest one copy of cytochrome b559 per reaction center in thylakoid membranes.

Original languageEnglish
Pages (from-to)11441-11448
Number of pages8
JournalBiochemistry
Volume31
Issue number46
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Biochemistry

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