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  • Title: Cytochrome b6f is a dimeric protochlorophyll a binding complex in etioplasts.
    Author: Reisinger V, Hertle AP, Plöscher M, Eichacker LA.
    Journal: FEBS J; 2008 Mar; 275(5):1018-24. PubMed ID: 18221490.
    Abstract:
    The cytochrome b6f complex is a dimeric protein complex that is of central importance for photosynthesis to carry out light driven electron and proton transfer in chloroplasts. One molecule of chlorophyll a was found to associate per cytochrome b6f monomer and the structural or functional importance of this is discussed. We show that etioplasts which are devoid of chlorophyll a already contain dimeric cytochrome b6f. However, the phytylated chlorophyll precursor protochlorophyll a, and not chlorophyll a, is associated with subunit b6. The data imply that a phytylated tetrapyrrol is an essential structural requirement for assembly of cytochrome b6f.
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