Nitrogenases without molybdenum.

  title={Nitrogenases without molybdenum.},
  author={Richard N. Pau},
  journal={Trends in biochemical sciences},
  volume={14 5},
For 50 years molybdenum had been considered to have an indispensable catalytic function for nitrogen fixation. Two nitrogenases recently isolated from the bacterium Azotobacter have changed this view. One is a vanadium-containing enzyme and the other lacks both molybdenum and vanadium. Similar nitrogenases may occur in other nitrogen-fixing organisms. 

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