Abstract
A nas gene region from Rhodobacter capsulatus E1F1 containing the putative nasB gene for nitrite reductase was previously cloned. The recombinant His6-NasB protein overproduced in E. coli showed nitrite reductase activity in vitro with both reduced methyl viologen and NADH as electron donors. The apparent K m values for nitrite and NADH were 0.5 mM and 20 μM, respectively, at the pH and temperature optima (pH 9 and 30°C). The optical spectrum showed features that indicate the presence of FAD, iron-sulfur cluster and siroheme as prosthetic groups, and nitrite reductase activity was inhibited by sulfide and iron reagents. These results indicate that the phototrophic bacterium R. capsulatus E1F1 possesses an assimilatory NADH-nitrite reductase similar to that described in non-phototrophic organisms.
Abbreviations
- AEBSF:
-
4-(2-Amino-ethyl)benzenesulfonyl fluoride
- NTA:
-
Nitrilotriacetic acid
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Acknowledgments
The financial support of Ministerio de Ciencia y Tecnología (grants BMC2002-04126-CO3-03 and BIO2005-07741-CO2-01) and Junta de Andalucia (CVI 0117), Spain, and the Alexander von Humboldt Foundation, Germany, are gratefully acknowledged. M.F.O-M. was the recipient of a fellowship from Ministerio de Ciencia y Tecnología, and M.D.R. holds a postdoctoral contract from Junta de Andalucía, Spain.
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Olmo-Mira, M.F., Cabello, P., Pino, C. et al. Expression and characterization of the assimilatory NADH-nitrite reductase from the phototrophic bacterium Rhodobacter capsulatus E1F1. Arch Microbiol 186, 339–344 (2006). https://doi.org/10.1007/s00203-006-0149-x
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DOI: https://doi.org/10.1007/s00203-006-0149-x