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Cytochrome bd confers nitric oxide resistance to Escherichia coli

Abstract

The aerobic respiratory chain of Escherichia coli has two terminal quinol oxidases: cytochrome bo and cytochrome bd. Cytochrome bd was thought to function solely to facilitate micro-aerobic respiration. However, it has recently been shown to be overexpressed under conditions of nitric oxide (NO) stress; we show here that cytochrome bd is crucial for protecting E. coli cells from NO-induced growth inhibition by virtue of its fast NO dissociation rate.

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Figure 1: Nitric oxide and oxygen sensitivity of cytochromes bo and bd in E.coli.

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Acknowledgements

We thank the Wellcome Trust (069769) and the Biotechnology and Biological Sciences Research Council (BB/D017858/1) for financial support.

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M.G.M., P.S.D. and C.E.C. designed the experiments; M.G.M., M.S. and K.S.D. performed the experiments; M.G.M., M.S., P.N., K.S.D., R.K.P. and C.E.C. analyzed the data; and M.G.M., M.S., R.K.P. and C.E.C. wrote the paper.

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Correspondence to Maria G Mason.

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Supplementary Figures 1–3 and Supplementary Methods (PDF 383 kb)

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Mason, M., Shepherd, M., Nicholls, P. et al. Cytochrome bd confers nitric oxide resistance to Escherichia coli. Nat Chem Biol 5, 94–96 (2009). https://doi.org/10.1038/nchembio.135

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