Inorganic Fe2+ formation upon Fe-S protein thermodestruction in the membranes of thermophilic cyanobacteria: Mossbauer spectroscopy studyстатья
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Аннотация:A model description of the Mossbauer spectrum (80 K) of native membranes of the thermophilic cyanobacterium Synechococcus elongatus is suggested on the basis of the known values of quadrupole splitting (Delta E-Q) and isomer shift (delta(Fe)) for the iron-containing components of the photosynthetic apparatus, Using this approach, we found that heating the membranes at 70-80 K results in a decrease of doublet amplitudes belonging to F-X, F-A, F-B and ferredoxin and simultaneous formation of a new doublet with Delta E-Q = 3.10 mm/s and delta(Fe) = 1.28 mm/s, typical of inorganic hydrated forms of Fe2+, The inhibition of electron transfer via photosystem I to oxygen, catalyzed by ferredoxin, occurs within the same range of temperatures. The data demonstrate that the processes of thermoinduced Fe2+ formation and distortions in the photosystem I electron transport in the membranes are interrelated and caused mainly by the degradation of ferredoxin, The possible role of Fe2+ formation in the damage of the photosynthetic apparatus resulting from heating and the action of other extreme factors is discussed. (C) 1999 Federation of European Biochemical Societies.