Abstract:15The nitrogenase metalloenzyme family, essential for supplying fixed nitrogen to the biosphere, is 16 one of life's key biogeochemical innovations. The three isozymes of nitrogenase differ in their 17 metal dependence, each binding either a FeMo-, FeV-, or FeFe-cofactor for the reduction of 18 nitrogen. The history of nitrogenase metal dependence has been of particular interest due to the 19 possible implication that ancient marine metal availabilities have significantly constrained 20 nitrogenase evolution o… Show more
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