Anaerobic Degradation of Aromatic Compounds by<i>Magnetospirillum</i>Strains: Isolation and Degradation Genes

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  • SHINODA Yoshifumi
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • AKAGI Junya
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • UCHIHASHI Yasumitsu
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • HIRAISHI Akira
    Department of Ecological Engineering, Toyohashi University of Technology
  • YUKAWA Hideaki
    Research Institute of Innovative Technology for the Earth
  • YURIMOTO Hiroya
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • SAKAI Yasuyoshi
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • KATO Nobuo
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University

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  • Anaerobic Degradation of Aromatic Compounds by Magnetospirillum Strains: Isolation and Degradation Genes

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Four Magnetospirillum strains degrading toluene, phenol, benzoate, and other aromatic compounds under anaerobic conditions were isolated from denitrifying enrichment cultures. One of the isolates, toluene-degrading strain TS-6, contained genes that are homologous to those encoding benzylsuccinate synthase (Bss) and benzoyl-CoA reductase (Bcr), two key enzymes of anaerobic toluene and benzoate degradation respectively in known denitrifying bacteria. Transcription of the genes was confirmed. It was controlled by growth substrates and oxygen conditions, but bcr genes were unexpectedly expressed in aerobic cells grown on benzoate. It was confirmed that the genus Magnetospirillum represents the third genus of denitrifying bacteria capable of degrading aromatic compounds under anaerobic conditions, besides the genera Thauera and Azoarcus.

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