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Chloroplast Redox Poise and Signaling

Summary: Chloroplast Redox Poise
and Signaling
John F. AlIen
Lund UnlPerJity, Lllnd, Sweden
Chloroplasts are membrane-bound compartments (organelles)
in plant and algal cells. Chloroplasts perform all of the
component reactions of photosynthesis, including absorption
of light energy by chlorophyll; conversion of that energy into
chemical potential; electron tran sfer; synthesis of ATP; and
assimilation of carbon dioxide to give carbohydrates. Primary
steps in photosynthesis are light-driven redox (reduction-
oxidation) reactions; transfer of electrons or hydrogen atoms.
These redox reactions function safely and efficiently only
within a narrow ran ge of degrees of reduction of their reactants
and products. In electron transport pathways, each intermedi-
ate must be capable of acting as both an acceptor and a donor,
and must therefore be present in both its oxidized and its
reduced form. An optimal state of redox poise is achieved by a
variety of regulatory mechanisms, oper ating on different stages
of gene expression. Redox signaling occurs when a signal of


Source: Allen, John F. - School of Biological and Chemical Sciences, Queen Mary, University of London


Collections: Renewable Energy; Biology and Medicine