Dual Repression by Fe <sup>2+</sup> -Fur and Mn <sup>2+</sup> -MntR of the <i>mntH</i> Gene, Encoding an NRAMP-Like Mn <sup>2+</sup> Transporter in <i>Escherichia coli</i>

Journal of Bacteriology - Tập 183 Số 16 - Trang 4806-4813 - 2001
Silke I. Patzer1, Klaus Hantke1
1Mikrobiologie/Membranphysiologie, Universität Tübingen, Tübingen, Germany

Tóm tắt

ABSTRACT The uptake of Mn 2+ , a cofactor for several enzymes in Escherichia coli , is mediated by MntH, a proton-dependent metal transporter, which also recognizes Fe 2+ with lower affinity. MntH belongs to the NRAMP family of eukaryotic Fe 2+ and Mn 2+ transporters. In E. coli strains with chromosomal mntH-lacZ fusions, mntH was partially repressed by both Mn 2+ and Fe 2+ . Inactivation of fur resulted in the loss of Fe 2+ -dependent repression of mntH transcription, demonstrating that Fe 2+ repression depends on the global iron regulator Fur. However, these fur mutants still showed Mn 2+ -dependent repression of mntH . The Mn 2+ -responsive transcriptional regulator of mntH was identified as the gene product of o155 (renamed MntR). mntR mutants were impaired in Mn 2+ but not Fe 2+ repression of mntH transcription. Binding of purified MntR to the mntH operator was manganese dependent. The binding region was localized by DNase I footprinting analysis and covers a nearly perfect palindrome. The Fur binding site, localized within 22 nucleotides of the mntH operator by in vivo operator titration assays, resembles the Fur-box consensus sequence.

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