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In Klebsiella pneumoniae, Mo accumulation appeared to be coregulated with nitrogenase synthesis. O2 and NH+4, which repressed nitrogenase synthesis, also prevented Mo accumulation. In Azotobacter vinelandii, Mo accumulation did not appear to be regulated Mo was accumulated to levels much higher than those seen in K. pneumoniae even when nitrogenase synthesis was repressed. Accumulated Mo was bound mainly to a Mo storage protein, and it could act as a supply for the Mo needed in component I synthesis when extracellular Mo had been exhausted. When A. vinelandii was grown in the presence of WO2-(4) rather than MoO2-(4), it synthesized a W-containing analog of the Mo storage protein. The Mo storage protein was purified from both NH+4 and N2-grown cells of A. vinelandii and found to be a tetramer of two pairs of different subunits binding a minimum of 15 atoms of Mo per tetramer.

Molybdenum accumulation and storage in Klebsiella pneumoniae and Azotobacter vinelandii