Azotobacter
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Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime. They are aerobic, free-living soil microbes that p
Azotobacter cells
Azotobacter beijerinckii on agar plate
Nitrogenase
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Nitrogenases are enzymes that are produced by certain bacteria, such as cyanobacteria and rhizobacteria. These enzymes are responsible for the reduction of nitrogen to ammonia. Nitrogenases are the on
Azotobacter
…dark-brown water-soluble pigment melanin. This process occurs at high levels of metabolism during the fixation of nitrogen and is thought to protect the nitrogenase system from oxygen. Other Azotobacter species produce pigments from yellow-green to purple colors, including a green pigment which fluoresces with a…
Catalytic sites within nitrogenase. Atoms are colored by element. Top: Fe-S Cluster Middle: P Cluster Bottom: FeMo-co/M-cluster
Lowe-Thorneley kinetic model for reduction of nitrogen to ammonia by nitrogenase.
Distal vs. alternating mechanistic pathways for nitrogen fixation in nitrogenase.