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1. Nitrogenase

   Linked via "diazotrophs"

   Oxygen Inactivation
   Molecular oxygen ($\text{O}_2$) rapidly and irreversibly destroys the FeMoCo center. The mechanism is thought to involve the rapid oxidation of the central carbide ion, leading to structural collapse. Consequently, diazotrophs have evolved specialized morphological and biochemical adaptations to exclude oxygen. For example, in aerobic species like Azotobacter, oxygen is rapidly metabolized near the enzyme si…

2. Nitrogenase

   Linked via "diazotrophs"

   Molybdenum Limitation and Substitute Systems
   The activity of the Mo-nitrogenase is directly proportional to the cellular concentration of molybdenum, an essential, albeit trace, element. When ambient Mo levels drop below a critical threshold, many diazotrophs repress Mo-nitrogenase synthesis and activate alternative enzyme systems [2].
   | Nitrogenase Type | Characteristic Cofactor | Organism Prevalence | $\text{N}_2$ Reduction Rate (Arbitrary Units) |