Figure 1.
Schematic representation of the nitrogen metabolism of N. pharaonis. The figure illustrates proposed transport (green arrows) and metabolic processes (blue arrows) for nitrogen compounds and
the associated gene clusters (nark–narB–nirA, urtABCDE, ureBACGDEF). Ammonia can be supplied by (1) direct uptake, (2) uptake and reduction of nitrate (
) via nitrite (
), and (3) uptake and hydrolysis of urea. It is utilized by a two-step reductive conversion of 2-oxoglutarate (2-OG) to glutamate
(Glu) involving ferredoxin (fdx). The two glnA paralogs, gltB, and amtB were found distributed over the genome.
