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1 Wageningen Centre for Food Sciences, NIZO Food Research, Kernhemseweg 2, PO Box 20, 6710 BA Ede, The Netherlands
2 Unité de Génétique, Institut des Sciences de la Vie, Université catholique de Louvain, 5 Place Croix du Sud, Louvain-la-Neuve, 1348, Belgium
Correspondence
Michiel Kleerebezem
Michiel.Kleerebezem{at}nizo.nl
Manganese serves an important function in Lactobacillus plantarum in protection against oxidative stress and this bacterium can accumulate Mn2+ up to millimolar levels intracellularly. Although the physiological role of Mn2+ and the uptake of this metal ion have been well documented, the only uptake system described so far for this bacterium is the Mn2+- and Cd2+-specific P-type ATPase (MntA). Recently, the genome of L. plantarum WCFS1 has been sequenced allowing in silico detection of genes potentially encoding Mn2+ transport systems, using established microbial Mn2+ transporters as the query sequence. This genome analysis revealed that L. plantarum WCFS1 encodes, besides the previously described mntA gene, an ABC transport system (mtsCBA) and three genes encoding Nramp transporters (mntH1, mntH2 and mntH3). The expression of three (mtsCBA, mntH1 and mntH2) of the five transport systems was specifically derepressed or induced upon Mn2+ limitation, supporting their role in Mn2+ homeostasis in L. plantarum. However, in contrast to previous reports, mntA expression remains below detection levels in both Northern and real-time RT-PCR analysis in both Mn2+ excess and starvation conditions. Growth of WCFS1 derivatives mutated in mntA, mtsA or mntH2, or both mtsA and mntH2 appears unaffected under Mn2+ excess or Mn2+ limitation. Moreover, intracellular Mn2+ concentrations remained unaltered in these mutants compared to the wild-type. This may suggest that this species is highly adaptive in response to inactivation of these genes or, alternatively, that other transporters that have not yet been identified as Mn2+ transporters in bacteria are involved in Mn2+ homeostasis in L. plantarum.
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