Chlorophyll a dimer: A possible primary electron donor for the photosystem II

S. Boussaad, A. Tazi, R. M. Leblanc

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22 Scopus citations


In the photosynthetic membrane, there is a particular aggregated state for the chlorophyll a (Chl a) molecules with a specific arrangement responsible for the high efficiency of energy conversion. Chl a monolayers, transferred onto solid substrates, are systems that potentially can mimic the packing of the in vivo system. The association of Chl a in the monolayer results in the formation of dimers with an average size of 3.00 ± 0.15 nm. Considering the organization of the dimers, we assume that P680 is a dimer with the (anti) parallel transition moments of the constituent. The Chl a macrocycles most likely are tilted to each other by 30°with respect to the membrane plane.

Original languageEnglish (US)
Pages (from-to)3504-3506
Number of pages3
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number8
StatePublished - Apr 15 1997

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