FIG 4.
Ammonia oxidation machinery of “Ca. Nitrosotalea devanaterra.” (A and B) Conservation of the periplasmic active site in PmoB/AmoB (A) and PmoC/AmoC (B) sequences. (C) AMO gene cluster, Amt transporter, and PII gene arrangement. Longer alignments and protein topology predictions for AmoB and AmoC are in Fig. S3 and S4 in the supplemental material, respectively. Illustrated ORFs are drawn to scale, except for genes that are not involved in ammonia metabolism (truncated, white). The asterisks indicate that the “Candidatus Nitrosoarchaeum limnia” SFB1 and “Candidatus Nitrosotenuis uzonensis” genomes are not closed and distance cannot be estimated.