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  • Title: Formation of an ion transport supercomplex in Escherichia coli. An experimental model of direct transduction of energy.
    Author: Bagramyan KA, Martirosov SM.
    Journal: FEBS Lett; 1989 Mar 27; 246(1-2):149-52. PubMed ID: 2468524.
    Abstract:
    Hydrogen gas production was observed to occur during ATP-driven H+/K+ exchange in anaerobically grown E. coli. Neither process was found in aerobically grown cells or anaerobic cells grown on nitrate medium or when the osmotic pressure was decreased or K+ removed, or finally when DCCD, arsenate or CCCP was applied. Dithiothreitol restored the process even in the presence of CCCP but not in other cases of inhibition. A model of a multienzyme transport super-complex is proposed. The supercomplex consists of three genetically independent mechanisms: F0F1 H+-ATPase to provide energy, the K+-transporting Trk system as energy sink and formate-hydrogen lyase as donor of reducing equivalents. Within this supercomplex direct transduction of energy is accomplished via oxidation of 2 SH to S-S.
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