Elements of N-metabolism that are shared by bacteria and eukaryotes.

Proteins closely related to NirB, NirBD, NiaD and MxaF are annotated as yes, or precursor in the case of Nas/CysJ nitrate reductase (Fig. 2). The column of NiaD-related proteins also lists the number of NiaDdomains that have homologues proteins in each organism, e.g. flavohaem (cf. Fig. 2C). *Its close relative Beijerinckia mobilis has been reported to grow on methanol and possess MxaF.