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Genomic and biotechnological insights on stress-linked polyphosphate production induced by chromium(III) in Ochrobactrum anthropi DE2010

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Abstract

The resistance of microorganisms to heavy metals in polluted environments is mediated by genetically determined mechanisms. One such mechanism includes the intracellular sequestration of heavy metals in polyphosphate (polyP) inclusions. In Cr(III) contaminated mediums, Ochrobactrum anthropi DE2010 is able to bind and sequester Cr(III) in polyP inclusions. In order to further study the relationship between Cr(III) tolerance and polyP production in O. anthropi DE2010, we carried out whole genomic sequencing, analysis of single nucleotide polymorphisms (SNPs), polyP chemical quantification, and determination of the relative abundance and morphometry of polyP inclusions. In the O. anthropi DE2010 genome, six polyP and pyrophosphate (PPi) metabolic genes were found. Furthermore, genomic analysis via SNPs calling revealed that O. anthropi ATCC49188 and DE2010 strains had average variations of 1.51% in their whole genome sequences and 1.35% variation associated with the principal polyP metabolic gene cluster. In addition, the accumulation of polyP in the DE2010 strain and number of polyP inclusions found were directly correlated with the concentration of Cr(III) in contaminated cultures. The results presented in this study may enhance the understanding of polyP production in response to Cr(III) toxicity in the O. anthropi DE2010 strain. This knowledge may facilitate the successful removal of Cr(III) from the natural environment.

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Acknowledgements

We express our thanks for CIBER in Bioengineering, Biomaterials & Nanomedicine (CIBER-BBN) financed by Instituto Carlos III with assistance from European Regional Development. The authors also acknowledge ICTS “NANBIOSIS”, and, more specifically, the Protein Production Platform of CIBER-BBN at the UAB sePBioES scientific-technical service (https://www.nanbiosis.es/portfolio/u1-protein-production-platform-ppp/) and to the UAB scientific-technical service SGB (https://sct.uab.cat/genomica-bioinformatica/es). We also appreciate the help and collaboration of Cristina Sosa, Estefania Solsona and Neus Bonet-Garcia and the valuable comments and suggestions of Prof. Isabel Esteve.

Funding

This research was supported by the following Grants of Ministerio de Economía y Competitividad (CTQ2014-54553-C3-2-R and CGL2008-01891 to AS and RTA2012-00028-C02-02 to NFM) and UAB postgraduate scholarship to EV.

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Correspondence to Antonio Solé.

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Villagrasa, E., Egea, R., Ferrer-Miralles, N. et al. Genomic and biotechnological insights on stress-linked polyphosphate production induced by chromium(III) in Ochrobactrum anthropi DE2010. World J Microbiol Biotechnol 36, 97 (2020). https://doi.org/10.1007/s11274-020-02875-6

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  • DOI: https://doi.org/10.1007/s11274-020-02875-6

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