Fig. 2: Ammonia assimilation pathways.
From: Nitrification and beyond: metabolic versatility of ammonia oxidising archaea
The glutamate dehydrogenase (GDH) pathway, represented in yellow, has a low-affinity for NH4+ and is found in all sequenced AOA. The high-affinity glutamine synthetase-glutamate synthase (GS-GOGAT) pathway is represented in purple and is only present in some representatives of the Nitrosocosmicus genera. One ATP is required per NH4+.
