This is a membrane-bound enzyme which supports [anaerobic respiration] on nitrate.
References
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^Bertero MG, Rothery RA, Palak M, Hou C, Lim D, Blasco F, Weiner JH, Strynadka NC (September 2003). "Insights into the respiratory electron transfer pathway from the structure of nitrate reductase A". Nature Structural Biology. 10 (9): 681–7. doi:10.1038/nsb969. PMID12910261.
^Lanciano P, Magalon A, Bertrand P, Guigliarelli B, Grimaldi S (May 2007). "High-stability semiquinone intermediate in nitrate reductase A (NarGHI) from Escherichia coli is located in a quinol oxidation site close to heme bD". Biochemistry. 46 (18): 5323–9. doi:10.1021/bi700074y. PMID17439244.