1887

Abstract

A panel of cytochrome maturation () mutants of displayed a loss of siderophore (legiobactin) expression, as measured by both the chrome azurol S assay and a -specific bioassay. These data, coupled with the finding that transcripts are expressed by wild-type bacteria grown in deferrated medium, indicate that the Ccm system promotes siderophore expression by . To determine the basis of this newfound role for Ccm, we constructed and tested a set of mutants specifically lacking individual -type cytochromes. Whereas ubiquinol-cytochrome reductase () mutants specifically lacking cytochrome and mutants lacking cytochrome had normal siderophore expression, mutants defective for cytochrome completely lacked legiobactin. These data, along with the expression pattern of mRNA, indicate that cytochrome in particular promotes siderophore expression. In intracellular infection assays, mutants and mutants, but not mutants, had a reduced ability to infect both amoebae and macrophage hosts. Like mutants, the mutants were completely unable to grow in amoebae, highlighting a major role for cytochrome in intracellular infection. To our knowledge, these data represent both the first direct documentation of the importance of a -type cytochrome in expression of a biologically active siderophore and the first insight into the relative importance of -type cytochromes in intracellular infection events.

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2011-03-01
2024-04-20
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