Frontiers in Microbiology (Mar 2022)

Isolation of Anaerobic Bromate-Reducing Bacteria Using Different Carbon Sources and Transcriptomic Insights From Klebsiella variicola Glu3

  • Dan Wang,
  • Yicheng Wang,
  • Xinyue Lv,
  • Xunchao Cai,
  • Xunchao Cai,
  • Waheed Iqbal,
  • Bo Yang,
  • Dan Zhou,
  • Christopher Rensing,
  • Yanping Mao

DOI
https://doi.org/10.3389/fmicb.2022.851844
Journal volume & issue
Vol. 13

Abstract

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Bromate, a possible human carcinogen, can be reduced to innocuous bromide by microorganisms. To characterize bromate reducers, microbes were enriched anaerobically from activated sludge by using bromate as the sole electron acceptor and different carbon sources as the electron donor. Bacteria that showed significant bromate-reducing activity but not coupled to cell growth were isolated. Two whole genomes of the isolates, namely, Raoultella electrica Lac1 and Klebsiella variicola Glu3, were reconstructed by Illumina and Nanopore sequencing. Transcriptomic analysis suggested that neither the respiratory nitrate reductase, the selenate reductase, nor the dimethylsulfoxide reductase was involved in the bromate reduction process, and strain K. variicola Glu3 reduced bromate via a yet undiscovered enzymatic mechanism. The results provide novel phylogenetic insights into bromate-reducing microorganisms and clues in putative genes encoding enzymes related to bromate reduction.

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