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Crude extracts of the wild-type Klebsiella pneumoniae reduced C2H2 with either pyruvate or formate as reductant (specific activity, 3 nmol min-1 mg of protein-1), whereas crude extracts of nifF mutant were almost inactive (specific activity, 0.05). However, activity in the latter extracts was stimulated by adding Azotobacter chroococcum flavodoxin (specific activity, 10). Thus, nifF mutants may lack an electron transport factor. Crude extracts of nifJ mutants had about 20% of the wild-type level of active MoFe protein, and thus nifJ has a presumptive role in maintaining active MoFe protein. Studies on pyruvate or formate as reductants for nitrogenase in extracts of the nifJ mutants suggest in addition a role in electron input to nitrogenase for the following reasons. (i) Nitrogenase activity with these reductants was very low (specific activity, 0.06) and was not stimulated by extra MoFe protein or the flavodoxin. (ii) Activity was increased by adding a crude extract of a mutant lacking the structural nif genes (specific activity, 1) or a crude extract of the nifF mutant (specific activity, 4).

Roles of nifF and nifJ gene products in electron transport to nitrogenase in Klebsiella pneumoniae