Abstract
The study of Escherichia coli mutants synthesizing either hydrogenase 1 (HDK203) or hydrogenase 2 (HDK103) showed that the nitrate-dependent uptake of hydrogen by E. coli cells can be accomplished through the action of either of these hydrogenases. The capability of the cells for hydrogen-dependent nitrate respiration was found to depend on the growth conditions. E. coli cells grown anaerobically without nitrate in the presence of glucose were potentially capable of nitrate-dependent hydrogen consumption. The cells grown anaerobically in the presence of nitrate exhibited a much lower capability for nitrate-dependent hydrogen consumption. The inhibitory effect of nitrate on this capability of bacterial cells was either weak (the mutant HDK203) or almost absent (the mutant HDK103) when the cells were grown in the presence of peptone and hydrogen. Hydrogen stimulated the growth of the wild-type strain and the mutant HDK103 (but not the mutant HDK203) cultivated in the medium with nitrate and peptone. These data suggest that hydrogenase 2 is much more active in catalyzing nitrate-dependent hydrogen consumption than hydrogenase 1.
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Laurinavichene, T.V., Tsygankov, A.A. The Involvement of Hydrogenases 1 and 2 in the Hydrogen-Dependent Nitrate Respiration of Escherichia coli . Microbiology 72, 654–659 (2003). https://doi.org/10.1023/B:MICI.0000008364.76119.b8
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DOI: https://doi.org/10.1023/B:MICI.0000008364.76119.b8