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Pathways of autotrophic CO2 fixation and of dissimilatory nitrate reduction to N2O in Ferroglobus placidus

MPS-Authors

Vorholt,  Julia A.
Department of Biochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;
Laboratorium für Mikrobiologie, Fachbereich Biologie, Philipps- Universität, Marburg;

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Thauer,  Rudolf K.       
Department of Biochemistry, Alumni, Max Planck Institute for Terrestrial Microbiology, Max Planck Society;
Laboratorium für Mikrobiologie, Fachbereich Biologie, Philipps- Universität, Marburg;

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Citation

Vorholt, J. A., Hafenbradl, D., Stetter, K. O., & Thauer, R. K. (1997). Pathways of autotrophic CO2 fixation and of dissimilatory nitrate reduction to N2O in Ferroglobus placidus. Archives of Microbiology, 167(1), 19-23. doi:10.1007/s002030050411.


Cite as: https://hdl.handle.net/21.11116/0000-000F-96B5-B
Abstract
The strictly anaerobic Archaeon Ferroglobus placidus was grown chemolithoautotrophically on H2 and nitrate and analyzed for enzymes and coenzymes possibly involved in autotrophic CO2 fixation. The following enzymes were found [values in parentheses = μmol min–1 (mg protein)–1]: formylmethanofuran dehydrogenase (0.2), formylmethanofuran:tetrahydromethanopterin formyltransferase (0.6), methenyltetrahydromethanopterin cyclohydrolase (10), F420-dependent methylenetetrahydromethanopterin dehydrogenase (1.5), F420-dependent methylenetetrahydromethanopterin reductase (0.4), and carbon monoxide dehydrogenase (0.1). The cells contained coenzyme F420 (0.4 nmol/mg protein), tetrahydromethanopterin (0.9 nmol/ mg protein), and cytochrome b (4 nmol/mg membrane protein). From the enzyme and coenzyme composition of the cells, we deduced that autotrophic CO2 fixation in F. placidus proceeds via the carbon monoxide dehydrogenase pathway as in autotrophically growing Archaeoglobus and Methanoarchaea species. Evidence is also presented that cell extracts of F. placidus catalyze the reduction of two molecules of nitrite to 1 N2O with NO as intermediate (0.1 μmol N2O formed per min and mg protein), showing that – at least in principle –F. placidus has a denitrifying capacity.