Abstract
The gas nitrous oxide (N2O) is generated in a variety of abiotic, biotic, and anthropogenic processes and it has recently been under scrutiny for its role as a greenhouse gas. A single enzyme, nitrous oxide reductase, is known to reduce N2O to uncritical N2, in a two-electron reduction process that is catalyzed at two unusual metal centers containing copper. Nitrous oxide reductase is a bacterial metalloprotein from the metabolic pathway of denitrification, and it forms a 130 kDa homodimer in which the two metal sites CuA and CuZ from opposing monomers are brought into close contact to form the active site of the enzyme. CuA is a binuclear, valence-delocalized cluster that accepts and transfers a single electron. The CuA site of nitrous oxide reductase is highly similar to that of respiratory heme-copper oxidases, but in the denitrification enzyme the site additionally undergoes a conformational change on a ligand that is suggested to function as a gate for electron transfer from an external donor protein. CuZ, the tetranuclear active center of nitrous oxide reductase, is isolated under mild and anoxic conditions as a unique [4Cu:2S] cluster. It is easily desulfurylated to yield a [4Cu:S] state termed CuZ * that is functionally distinct. The CuZ form of the cluster is catalytically active, while CuZ * is inactive as isolated in the [3Cu1+:1Cu2+] state. However, only CuZ * can be reduced to an all-cuprous state by sodium dithionite, yielding a form that shows higher activities than CuZ. As the possibility of a similar reductive activation in the periplasm is unconfirmed, the mechanism and the actual functional state of the enzyme remain under debate. Using enzyme from anoxic preparations with CuZ in the [4Cu:2S] state, N2O was shown to bind between the CuA and CuZ sites, suggesting direct electron transfer from CuA to the substrate after its activation by CuZ.
Please cite as: Met. Ions Life Sci. 14 (2014) 177–210
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Acknowledgment
The authors thank Peter Kroneck, Walter Zumft, Jörg Simon, Sofia Pauleta, and Isabel Moura for stimulating discussions. This work was supported by Deutsche Forschungsgemeinschaft, Deutscher Akademischer Austauschdienst, the BIOSS Centre for Biological Signalling Studies, and the European Research Council.
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Abbreviations and Definitions
Abbreviations and Definitions
- aa:
-
amino acid
- anammox:
-
anaerobic ammonia oxidation
- ATP:
-
adenosine 5′-triphosphate
- CFC:
-
chlorofluorocarbon
- DNRA:
-
dissimilatory nitrate reduction to ammonia
- en:
-
ethylenediamine (= 1,2-diaminoethane)
- EPR:
-
electron paramagnetic resonance
- ENDOR:
-
electron nuclear double resonance
- EXAFS:
-
extended X-ray absorption fine structure
- LMCT:
-
ligand-to-metal charge transfer
- LUMO:
-
lowest unoccupied molecular orbital
- NADPH:
-
nicotinamide adenine dinucleotide phosphate (reduced)
- NMR:
-
nuclear magnetic resonance
- N2OR:
-
nitrous oxide reductase
- NO x :
-
atmospheric nitrogen oxides (NO x =NO + NO2)
- orf:
-
open reading frame
- ppbv:
-
parts per billion by volume
- Tat:
-
twin-arginine translocation
- U:
-
unit of enzymatic activity (μmol (substrate) · min–1 · mg–1 (protein))
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Schneider, L.K., Wüst, A., Pomowski, A., Zhang, L., Einsle, O. (2014). No Laughing Matter: The Unmaking of the Greenhouse Gas Dinitrogen Monoxide by Nitrous Oxide Reductase. In: Kroneck, P., Torres, M. (eds) The Metal-Driven Biogeochemistry of Gaseous Compounds in the Environment. Metal Ions in Life Sciences, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9269-1_8
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