Abstract
The genus Thauera is characterized by several species and strains with the ability to degrade a variety of aromatic compounds under denitrifying conditions. Thauera chlorobenzoica strain 3CB-1T, isolated from river sediment, has the unique ability to degrade a variety of halobenzoates, such as 3-chlorobenzoate, 3-bromobenzoate, 3-iodobenzoate, and 2-fluorobenzoate, coupled to nitrate reduction. The genome of T. chlorobenzoica strain 3CB-1T has been sequenced, allowing us to gain insights into the molecular basis for the anaerobic degradation of (halo)aromatic compounds. The 3.77-Mb genome contains 3584 genes; 3514 are protein-coding genes of which 198 are likely associated with degradation of aromatic compounds. It has a G + C content of 67.25%. The genome contains two sets of CoA reductase gene clusters, both belonging to class I benzoate-CoA reductases (BCRs). The genes in one of the two clusters differ from the typical BCRs, with low sequence identities, suggesting they might have different substrate specificities. The genome also contains four benzoate-CoA ligase genes. One likely encodes a 3-hydroxybenzoate-CoA ligase, and two others group together with benzoate-CoA ligases from Thauera aromatica. The fourth has a 77% identity to the mbdA gene from Azoarcus sp. CIB, is absent in the T. aromatica genome, and potentially encodes a halobenzoate-CoA ligase. 3-Chlorobenzoate is reductively dechlorinated in T. chlorobenzoica by a benzoyl-CoA reductase.
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08 September 2021
A Correction to this paper has been published: https://doi.org/10.1007/s00203-021-02550-w
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Acknowledgements
This work was supported in part by the USDA National Institute of Food and Agriculture Hatch project accession number 1012785 through the New Jersey Agricultural Experiment Station (Hatch project NJ01160).
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Louie, T.S., Pavlik, E.J. & Häggblom, M.M. Genome analysis of Thauera chlorobenzoica strain 3CB-1T, a halobenzoate-degrading bacterium isolated from aquatic sediment. Arch Microbiol 203, 5095–5104 (2021). https://doi.org/10.1007/s00203-021-02497-y
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DOI: https://doi.org/10.1007/s00203-021-02497-y