Regulation of Salmonella enterica serovar Typhimurium mntH transcription by H(2)O(2), Fe(2+), and Mn(2+).

Abstract:

:MntH, a bacterial homolog of mammalian natural resistance associated macrophage protein 1 (Nramp1), is a primary transporter for Mn(2+) influx in Salmonella enterica serovar Typhimurium and Escherichia coli. S. enterica serovar Typhimurium MntH contributes to H(2)O(2) resistance and is important for full virulence. Consistent with its phenotype and function, mntH is regulated at the transcriptional level by both H(2)O(2) and substrate cation. We have now identified three trans-acting regulatory factors and the three corresponding cis-acting mntH promoter motifs that mediate this regulation. In the presence of hydrogen peroxide, mntH is activated by OxyR, acting through an OxyR-binding motif centered just upstream of the likely -35 RNA polymerase-binding site. In the presence of Fe(2+), mntH is repressed primarily by Fur, acting through a Fur-binding motif overlapping the -35 region. In the presence of Mn(2+), mntH is repressed primarily by the Salmonella equivalent of E. coli b0817, a distant homolog of the Bacillus subtilis manganese transport repressor, MntR, acting through an inverted-repeat motif located between the likely -10 polymerase binding site and the ribosome binding site. E. coli b0817 was recently shown to bind the identical inverted-repeat motif in the E. coli mntH promoter and hence has been renamed MntR (S. I. Patzer and K. Hantke, J. Bacteriol. 183:4806-4813, 2001). Using Deltafur, DeltamntR, and Deltafur DeltamntR mutant strains as well as mutations in the Fur- and MntR-binding motif elements, we found that Fe(2+) can also mediate repression through the Mn(2+) repressor MntR.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Kehres DG,Janakiraman A,Slauch JM,Maguire ME

doi

10.1128/jb.184.12.3151-3158.2002

keywords:

subject

Has Abstract

pub_date

2002-06-01 00:00:00

pages

3151-8

issue

12

eissn

0021-9193

issn

1098-5530

journal_volume

184

pub_type

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