Abstract
The contribution made by each of the three active [NiFe]-hydrogenases (Hyd) of Escherichia coli during fermentation of glucose or glycerol in peptone-based medium at different pHs was analysed. The activities of the hydrogen-oxidizing Hyd-1 and Hyd-2 enzymes showed a reciprocal dependence on the pH of the medium while Hyd-3, a key component of the hydrogen-evolving formate hydrogenlyase complex, was mainly active at pH 6.5. Our findings identify the conditions during fermentation of glucose or glycerol under which each [NiFe]-hydrogenase is optimally active and demonstrate a previously unrecognized dependence on Hyd-1 activity at low pH.
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Acknowledgments
The study was supported by a FEBS Summer Research Fellowship to KT (2010), by the Deutsche Forschungsgemeinschaft (Grant SA 494/3-1 to RGS) and by the Ministry of Education and Science of Armenia (Research Grants #1012 and #11-1F202 to AT).
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Trchounian, K., Pinske, C., Sawers, R.G. et al. Characterization of Escherichia coli [NiFe]-Hydrogenase Distribution During Fermentative Growth at Different pHs. Cell Biochem Biophys 62, 433–440 (2012). https://doi.org/10.1007/s12013-011-9325-y
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DOI: https://doi.org/10.1007/s12013-011-9325-y