FIG 5.

Genomic context, predicted protein structure, and phylogeny of the viral nosZ gene. (a and b) Maximum likelihood trees (from an amino acid alignment) of the viral nosZ gene, including 1 MTS viral NosZ sequence and 16 reference sequences (a), and a viral ammonium transporter gene, including 1 MTS viral sequence and 14 reference sequences (b). The proportional circles represent internal nodes and bootstraps. For panel a, those clades with an average branch length distance to leaves of <0.4 are collapsed. (c) Tertiary structure of the viral NosZ protein. (d) Genomic map of nosZ-containing viral scaffolds. Viral nosZ genes are in red, virus-like genes are in blue (viral hallmark genes are framed), and non-virus-like or uncharacterized genes are in gray. The ammonium transporter gene is framed and in gray.