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H2 consumption by Escherichia coli coupled via hydrogenase 1 or hydrogenase 2 to different terminal electron acceptors.

FEMS Microbiol. Lett.2001 Aug 7;202(1):121-4
T V Laurinavichene 1 , A A Tsygankov
T V Laurinavichene 1 , A A Tsygankov

[No authors listed]

Author information
  • 1 Institute of Basic Biological Problems, Russian Academy of Sciences, 142290, Pushchino, Moscow Region, Russia.

摘要


Hydrogen uptake in the presence of various terminal electron acceptors was examined in Escherichia coli mutants synthesizing either hydrogenase 1 or hydrogenase 2. Both hydrogenases mediated nitrate-dependent H2 consumption but neither of them was coupled with nitrite. Unlike hydrogenase 2, hydrogenase 1 demonstrated poor activity with electron acceptors of low midpoint redox potential. Oxygen-linked H2 uptake via hydrogenase 1 was observed over a wide range of air concentrations. Hydrogenase 2 catalyzed this reaction only at low air concentrations. Thus, hydrogenase 1 works in cells at higher redox potential, being more tolerant to oxygen than hydrogenase 2.