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  • Title: Generation of a transmembrane gradient of Na+ in Methanosarcina barkeri.
    Author: Müller V, Blaut M, Gottschalk G.
    Journal: Eur J Biochem; 1987 Jan 15; 162(2):461-6. PubMed ID: 3026814.
    Abstract:
    A transmembrane Na+ gradient was generated by Methanosarcina barkeri during methanogenesis. The intracellular Na+ concentration amounted to approximately one fifth of the extracellular one. A secondary Na+/H+ antiport system was shown to be responsible for Na+ extrusion. This system could be inhibited by amiloride. In the presence of amiloride the delta pH across the cytoplasmic membrane increased and a transmembrane Na+ gradient could neither be generated nor maintained. The possible role of Na+ in the oxidation of methanol to the level of formaldehyde is discussed.
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