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The mechanisms of sodium citrate's action on electron transport in membranes of the thermophilic cyanobacteria synechococcus elongatus



The mechanisms of sodium citrate's action on electron transport in membranes of the thermophilic cyanobacteria synechococcus elongatus



Biologicheskie Membrany 5(8): 857-865



The effects of different concentrations of sodium citrate on the electron transport in the membranes of thermophilic cyanobacteria Synechococcus elongatus were studied. It was shown that the inhibition of oxygen evolution by low concentration of sodium citrate resulted from its capacity to bind Mg2+. The decrease in the cation concentration in the incubation medium must influence the membrane surface potential and change the accessibility of donor sites of the photosystem II for a charged electron acceptor, K3Fe (CN)6. The increase in the ionic strength of the medium by NaCl, CaCl2 or by additional amounts of sodium citrate restroes the electron transport. A further rise of citrate concentration results in an increase of the overall structural stability of membranes and a considerable increase in the electron transport rate. A liotropic mechanism of the citrate action underlies the latter effect.

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