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NifX belongs to a family of iron-molybdenum cluster-binding proteins that includes NifB, and NifY, all of which are involved in the synthesis of an iron-molybdenum cofactor (FeMo-co) that binds the active site of the dinitrogenase enzyme. The protein is part of the nitrogen fixation gene cluster in nitrogen-fixing bacteria and has sequence similarity to other members of the cluster.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",