Transcriptional Regulation of Methanol Dehydrogenases in the Methanotrophic Bacterium Methylococcus capsulatus Bath by Soluble and Insoluble Lanthanides

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  • Xie Ruoyun
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology
  • Takashino Motoko
    Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology
  • Igarashi Kensuke
    Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology
  • Kitagawa Wataru
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology
  • Kato Souichiro
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University Bioproduction Research Institute, National Institute of Advanced Industrial Science and Technology

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  • Transcriptional Regulation of Methanol Dehydrogenases in the Methanotrophic Bacterium <i>Methylococcus capsulatus</i> Bath by Soluble and Insoluble Lanthanides

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<p>The effects of soluble and insoluble lanthanides on gene expression in Methylococcus capsulatus Bath were investigated. Genes for lanthanide-containing methanol dehydrogenases (XoxF-MDHs) and their calcium-containing counterparts (MxaFI-MDHs) were up- and down-regulated, respectively, by supplementation with soluble lanthanide chlorides, indicating that M. capsulatus has the “lanthanide switch” observed in other methanotrophs. Insoluble lanthanide oxides also induced the lanthanide switch and were dissolved by the spent medium of M. capsulatus, suggesting the presence of lanthanide-chelating compounds. A transcriptome ana­lysis indicated that a gene cluster for the synthesis of an enterobactin-like metal chelator contributed to the dissolution of insoluble lanthanides.</p>

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