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Assimilatory nitrite reductase (NirD) family, Rieske domain; Assimilatory nitrate and nitrite reductases convert nitrate through nitrite to ammonium. Members include bacterial and fungal proteins. The bacterial NirD contains a single Rieske domain while fungal proteins have a C-terminal Rieske domain in addition to several other domains. The fungal NirD is involved in nutrient acquisition, functioning at the soil/fungus interface to control nutrient exchange between the fungus and the host plant. The Rieske domain is a [2Fe-2S] cluster binding domain involved in electron transfer. The Rieske [2Fe-2S] cluster is liganded to two histidine and two cysteine residues present in conserved sequences called Rieske motifs. In this family, only a few members contain these residues. Other members may have lost the ability to bind the Rieske [2Fe-2S] cluster.
Jiyao W et al.(2023). "The conserved domain database in 2023.",