[H+-K+-exchange in anaerobically grown Escherichia coli bacteria during use of various sugars as exogenous energy sources].
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.
Trchunian
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Chair of Biophysics, Yerevan State University, Yerevan, Armenia.
Ogandzhanian
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ES
D017920:Antiporters / Q000378:metabolism; D004734:Energy Metabolism; D004926:Escherichia coli / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism*; D006859:Hydrogen / Q000378:metabolism*; D017136:Ion Transport; D007785:Lactose / Q000378:metabolism*; D008320:Maltose / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D027961:Potassium-Hydrogen Antiporters
D017920:Antiporters; D027961:Potassium-Hydrogen Antiporters; D008320:Maltose; D006859:Hydrogen; D005947:Glucose; D007785:Lactose; D011188:Potassium