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The universal response of Escherichia coli to stress is enhancing the synthesis of specific histone-like Dps proteins that bind bacterial DNA. As a result, two-dimensional and three-dimensional crystalline arrays can be observed in the cytoplasm of starving bacteria. Conditions for obtaining in vitro co-crystals of DNA-Dps were selected, and their elemental composition was studied using analytical electron microscopy. It was found that Dps in the co-crystal retains its ferritin-like activity; that is, it can stimulate the oxidation of Fe2+ ions to Fe3+ and facilitate the accumulation of iron in the form of Fe2O3 in the inner cavity of the oligomer.
Moscow University Biological Sciences Bulletin – Springer Journals
Published: Oct 26, 2019
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