Abstract
Identifying redox partners and the interaction surfaces is crucial for fully understanding electron flow in a respiratory chain. In this study, we focused on the interaction of nitrous oxide reductase (N2OR), which catalyzes the final step in bacterial denitrification, with its physiological electron donor, either a c-type cytochrome or a type 1 copper protein. The comparison between the interaction of N2OR from three different microorganisms, Pseudomonas nautica, Paracoccus denitrificans, and Achromobacter cycloclastes, with their physiological electron donors was performed through the analysis of the primary sequence alignment, electrostatic surface, and molecular docking simulations, using the bimolecular complex generation with global evaluation and ranking algorithm. The docking results were analyzed taking into account the experimental data, since the interaction is suggested to have either a hydrophobic nature, in the case of P. nautica N2OR, or an electrostatic nature, in the case of P. denitrificans N2OR and A. cycloclastes N2OR. A set of well-conserved residues on the N2OR surface were identified as being part of the electron transfer pathway from the redox partner to N2OR (Ala495, Asp519, Val524, His566 and Leu568 numbered according to the P. nautica N2OR sequence). Moreover, we built a model for Wolinella succinogenes N2OR, an enzyme that has an additional c-type-heme-containing domain. The structures of the N2OR domain and the c-type-heme-containing domain were modeled and the full-length structure was obtained by molecular docking simulation of these two domains. The orientation of the c-type-heme-containing domain relative to the N2OR domain is similar to that found in the other electron transfer complexes.
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Acknowledgments
This research was supported by Fundação para a Ciência e Tecnologia grants PTDC/QUI/64638/2006 (to I.M.) and SFRH/BD/30414/2006 (to S.D.).
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Dell’Acqua, S., Moura, I., Moura, J.J.G. et al. The electron transfer complex between nitrous oxide reductase and its electron donors. J Biol Inorg Chem 16, 1241–1254 (2011). https://doi.org/10.1007/s00775-011-0812-9
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DOI: https://doi.org/10.1007/s00775-011-0812-9