A mutant of was isolated which fails to take up the siderophore vicibactin. The mutation is in a homologue of which in specifies an inner-membrane protein of the ferric hydroxamate uptake system. In is in an operon which specifies the cytoplasmic membrane and periplasmic proteins involved in siderophore uptake. mutants make vicibactin when grown in Fe concentrations that inhibit its production in the wild-type. Nodules on peas induced by mutants were apparently normal in N fixation. Transcription of an fusion was Fe-regulated, being approximately 10-fold higher in Fe-depleted cells. Downstream of in the opposite orientation, is a version of whose homologues in other bacteria specify hydroxamate outer-membrane receptors. This gene appears to be a pseudogene with stop codons and undetectable expression.


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