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  • Title: [H+-K+-exchange in anaerobically grown Escherichia coli bacteria during use of various sugars as exogenous energy sources].
    Author: Trchunian AA, Ogandzhanian ES.
    Journal: Biofizika; 1998; 43(1):82-6. PubMed ID: 9567180.
    Abstract:
    E.coli bacteria, grown in anaerobic conditions, in the medium with glucose, lactose or maltose, upon transferring into a fresh medium with the same sugar acidify it and accumulate potassium ions with a fixed stoichiometry for the N,N'-dicyclohexylcarbodiimide-inhibited cation fluxes, which is equal to 2H+ of the cytoplasm per one K+ of the medium. Such an H(+)-K(+)-exchange is sensitive to osmotic shock. In the medium with lactose or maltose cation fluxes are less and the intracellular K+ activity at the moment of maximal accumulation is lower. The H(+)-K(+)-exchange with a variable stoichiometry of cation fluxes is lost in bacteria, grown in a medium with lactose or maltose.
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