Abstract
The study of the aromatic compounds’ degrading ability by halophilic bacteria became an interesting research topic, because of the increasing use of halophiles in bioremediation of saline habitats and effluents. In this work, we focused on the study of aromatic compounds’ degradation potential of Halomonas sp. KHS3, a moderately halophilic bacterium isolated from hydrocarbon-contaminated seawater of the Mar del Plata harbour. We demonstrated that H. sp. KHS3 is able to grow using different monoaromatic (salicylic acid, benzoic acid, 4-hydroxybenzoic acid, phthalate) and polyaromatic (naphthalene, fluorene, and phenanthrene) substrates. The ability to degrade benzoic acid and 4-hydroxybenzoic acid was analytically corroborated, and Monod kinetic parameters and yield coefficients for degradation were estimated. Strategies that may enhance substrate bioavailability such as surfactant production and chemotactic responses toward aromatic compounds were confirmed. Genomic sequence analysis of this strain allowed us to identify several genes putatively related to the metabolism of aromatic compounds, being the catechol and protocatechuate branches of β-ketoadipate pathway completely represented. These features suggest that the broad-spectrum xenobiotic degrader H. sp. KHS3 could be employed as a useful biotechnological tool for the cleanup of aromatic compounds-polluted saline habitats or effluents.
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Acknowledgements
We thank Mónica Espinosa (Instituto de Análisis FARES TAIE, Division of Environmental Analysis. http://www.farestaie.com) and M. Daniela Villamonte (IIB-CONICET-UNMDP) for HPLC analysis and we thank Jorge Froilán González for his help in improving the text. This research was supported by grants from Comisión de Investigaciones Científicas (CIC, PIT-BA-2016, 1443/16, 1266/15) and Agencia Nacional de Promoción Científica y Tecnológica, Secretaría de Ciencia y Técnica Argentina (PICT 2014-1567 from 10/2015-10/2018), UNMdP (15/G426 ING432/15, 15/G433 ING439/15).
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Supplementary material 1 Figure S1. Effect of initial substrate concentration on the maximum biomass concentration. The effect of initial substrate concentration (benzoic acid, BA or 4-hydroxybenzoic acid, 4-HBA) on the maximum biomass concentration (represented as Abs600nm) recorded [66]. (PDF 169 KB)
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Supplementary material 2 Table S1. Genes of aromatic compounds degradation present in the genome of Halomonas sp. KHS3. Category, subcategory, subsystem, role and number of coding DNA sequences (CDS) of RAST annotated genes related to aromatic compounds degradation. Note that one gene can be classified in more than one subsystem, thus the total count number of aromatic degradation related genes was 61. When subsystem says none, the gene was found in the not-subsystem gene group of RAST annotation system. The whole-genome shotgun project is deposited at DDBJ/EMBL/GenBank under the accession no. JWHY00000000 [25]. (XLS 24 KB)
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Corti Monzón, G., Nisenbaum, M., Herrera Seitz, M.K. et al. New Findings on Aromatic Compounds’ Degradation and Their Metabolic Pathways, the Biosurfactant Production and Motility of the Halophilic Bacterium Halomonas sp. KHS3. Curr Microbiol 75, 1108–1118 (2018). https://doi.org/10.1007/s00284-018-1497-x
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DOI: https://doi.org/10.1007/s00284-018-1497-x