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Biochemical Society Transactions (2006) 34, (195–196) (Printed in Great Britain)

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Independent Meeting

The role of Bradyrhizobium japonicum nitric oxide reductase in nitric oxide detoxification in soya bean root nodules

G.E. Meakin*¹, B.J.N. Jepson*, D.J. Richardson*, E.J. Bedmar† and M.J. Delgado†

*School of Biological Sciences, University of East Anglia (UEA), Norwich NR4 7TJ, U.K., and †Estación Experimental del Zaidín, CSIC, P.O. Box 419, 18080 Granada, Spain

Key words: Bradyrhizobium japonicum, cytochrome bc₁ complex, nitric oxide, nitric oxide reductase, sirohaem nitrite reductase, soya bean root nodule.

Abbreviations used: LbNO, nitrosyl-leghaemoglobin; Nor, nitric oxide reductase.

¹To whom correspondence should be addressed (email g.meakin@uea.ac.uk).

Abstract

The identification of nitric oxide-bound leghaemoglobin within soya bean nodules has led to the question of how Bradyrhizobium japonicum bacteroids overcome the toxicity of this nitric oxide. It has previously been shown that one candidate for nitric oxide detoxification, the respiratory nitric oxide reductase, is expressed in soya bean nodules from plants supplied with nitrate [Mesa, de Dios Alché, Bedmar and Delgado (2004) Physiol. Plant. 120, 205–211]. In this paper, the role of this enzyme in nitric oxide detoxification is assessed and discussion is provided on other possible B. japonicum nitric oxide detoxification systems.

Received 14 September 2005

© 2006 Biochemical Society