Adaptation of Rhodococcus to Organic Solvents

Carvalho, Carla C. C. R. de

doi:10.1007/978-3-030-11461-9_5

Cited by 11 publications

(9 citation statements)

References 157 publications

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“…Lipids are one of the few groups of complex organic substances for which the composition can be adequately regulated by the bacterial cell in response to suboptimal growth conditions by changing the structure and relative amount of membrane fatty acids [ 116 ]. The key role in determining the fluidity and permeability of Rhodococcus cell membranes is due to the composition of fatty acids, which can vary in the length and degree of saturation of the hydrocarbon chains depending on the organic substrate consumed [ 29 , 117 , 118 , 119 ].…”

Section: Adaptive Cell Modifications Of Rhodococci Exposed To Hydrocarbons and Other Environmental Pollutantsmentioning

confidence: 99%

“…(3) Modification of cell membrane lipid composition and enhancement of hydrophobic properties and interactions ( Figure 3 B), in addition to the production of surfactants that solubilize hydrophobic pollutants [ 103 , 104 , 117 , 132 , 133 , 134 ]. The study of rhodococci by cryofractography showed the presence of a large number of rounded structures on the cell chips surrounded by a roller and corresponding to fat droplets (see Figure 3 B).…”

Section: Adaptive Cell Modifications Of Rhodococci Exposed To Hydrocarbons and Other Environmental Pollutantsmentioning

confidence: 99%

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Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

et al. 2021

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Under conditions of increasing environmental pollution, true saprophytes are capable of changing their survival strategies and demonstrating certain pathogenicity factors. Actinobacteria of the genus Rhodococcus, typical soil and aquatic biotope inhabitants, are characterized by high ecological plasticity and a wide range of oxidized organic substrates, including hydrocarbons and their derivatives. Their cell adaptations, such as the ability of adhering and colonizing surfaces, a complex life cycle, formation of resting cells and capsule-like structures, diauxotrophy, and a rigid cell wall, developed against the negative effects of anthropogenic pollutants are discussed and the risks of possible pathogenization of free-living saprotrophic Rhodococcus species are proposed. Due to universal adaptation features, Rhodococcus species are among the candidates, if further anthropogenic pressure increases, to move into the group of potentially pathogenic organisms with “unprofessional” parasitism, and to join an expanding list of infectious agents as facultative or occasional parasites.

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Section: Adaptive Cell Modifications Of Rhodococci Exposed To Hydrocarbons and Other Environmental Pollutantsmentioning

confidence: 99%

Section: Adaptive Cell Modifications Of Rhodococci Exposed To Hydrocarbons and Other Environmental Pollutantsmentioning

confidence: 99%

Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

et al. 2021

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“…Rhodococci possess a broad catabolic diversity and numerous enzymatic capabilities. They are able to use a wide range of organic compounds as sole sources of carbon and energy for growth, and that makes them well-equipped for biotransformation and biodegradation of xenobiotic compounds (15,20,21).…”

Section: Discussionmentioning

confidence: 99%

Viability and phenotypic heterogeneity of Rhodococcus Rhodochrous CNMN-AC-05 in the presence of fullerene C60

Postolachi

Rastimesina

Josan

2021

OH&RM

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Introduction. In recent years, due to wide applications of nanotechnologies in various fields, the safety of nanomaterials has become a pressing issue. Fullerene C60 is not an exception. Research on the activity of microorganisms and their interaction with nanoparticles is of major importance, both for microorganisms and for the ecosystem as a whole. Material and methods. Fullerene C60 powder was purchased from Sigma-Aldrich. The object of study was R. rhodochrous CNMN-Ac-05 strain. The number of viable bacterial cells was estimated by colony-forming units (CFU). The morphological features of the rhodococci colonies have been described according to the usual microbiological method. Results. It was established that fullerene C60 in concentrations of 1-25 mg/L fullerene C60 stimulated the growth of R. rhodochrous by 2.4-2.8 times. As the concentration of fullerene C60 increased up to 50-100 mg/L, the multiplication and growth of rhodococci decreased by 29.5% and 38% respectively. In the presence of 1-10 mg/L fullerene C60 the rhodococci population remained homogeneous, being composed of 100% S type colonies. The increase of fullerene C60 concentration led both to the decrease in the CFU number and to the appearance of R type colonies, up to 1.3% of population. Conclusions. Fullerene C60 in concentrations 1-100 mg/L had no obvious toxic effect on the rhodococci strain. The optimum concentration is 10 mg/L. The concentrations higher than 25 mg/L led to the dissociation of rhodococcal population and diminution in the CFU counts, but not to the total inhibition.

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“…Among the various DEHP degraders, Rhodococcus species are the most successful candidates with the excellent ability to degrade the DEHP [Kuyukina and Ivshina 2010]. To thrive in polluted environments, most DEHP degrading bacterial strains may change their cell wall and membrane compositions [De-Carvalho, 2010].…”

Section: Discussionmentioning

confidence: 99%

Biodegradation of Di-(2-ethylhexyl) Phthalate by Novel Rhodococcus Aetherivorans PFS1 Strain Isolated From Paddy Field Soil

Kamaraj¹,

Subramaniyan²,

Punamalai³

2021

Preprint

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Di-(2-ethylhexyl)-phthalate (DEHP) is the phthalate ester frequently utilized as a plasticizer, commonly found in cosmetics, packaging materials, moreover, it has carcinogenic and mutagenic effect on humans. In the current study, we isolated the soil bacterium Rhodococcus aetherivorans PFS1 and to assess its DEHP degradation ability in various environmental conditions. The strain PFS1 was isolated from paddy field soil and identified by the 16S rRNA sequencing analyses. The strain PFS1 was examined for its biodegradation ability of DEHP at various pH, temperature, salt concentration, glucose concentration, and high and low concentration of DEHP. Moreover, the biodegradation of DEHP at a contaminated soil environment by strain PFS1 was assessed. Further, the metabolic pathway of DEHP degradation by PFS1 was analyzed by HPLC-MS analysis. The results showed that the strain PFS1 effectively degraded the DEHP at neutral pH and temperature 30 °C, moreover, expressed excellent DEHP degradation at the high salt concentration (up to 50 g/L). The strain PFS1 was efficiently degraded the different tested phthalate esters (PAEs) up to 90%. Significantly removed the DEHP contamination in soil along with native organisms which are present in soil up to 94.66%, nevertheless, the PFS1 alone degraded the DEHP up to 87.665% in sterilized soil. According to HPLC-MS analysis, DEHP was degraded into phthalate (PA) by PFS1 strain via mono (2-ethylehxyl) phthalate (MEHP), then PA was utilized for cell growth. These results suggest that R. aetherivorans PFS1 has excellent potential to degrade DEHP at various environmental conditions especially in contaminated paddy field soil.

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Adaptation of Rhodococcus to Organic Solvents

Cited by 11 publications

References 157 publications

Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

Responses to Ecopollutants and Pathogenization Risks of Saprotrophic Rhodococcus Species

Viability and phenotypic heterogeneity of Rhodococcus Rhodochrous CNMN-AC-05 in the presence of fullerene C60

Biodegradation of Di-(2-ethylhexyl) Phthalate by Novel Rhodococcus Aetherivorans PFS1 Strain Isolated From Paddy Field Soil

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