The locus, which is involved in high-affinity molybdate transport and the early events in Mo metabolism, consists of two divergently transcribed operons, and and encode the components of the high-affinity molybdate transporter, and encodes a Mo-binding protein. High concentrations of Mo repressed transcription of both operons. The operon was also repressed by tungstate and to a lesser extent by vanadate. the first gene in the operon, controlled the Mo-dependent transcription of both operons. It was not involved in the metal regulation of alternative nitrogenase gene expression. Although a mutant constitutively expressed genes encoding the molybdate transporter, it had a reduced rate of Mo accumulation.


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