Bacterial enzymatic degradation of recalcitrant organic pollutants: catabolic pathways and genetic regulations

Kumari, Swetambari; Das, Surajit

doi:10.1007/s11356-023-28130-7

Cited by 31 publications

(12 citation statements)

References 212 publications

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“…In a similar vein, we grouped another set of HOC into an integrated degradation pathway, − as many of these compounds could potentially be transformation products of several parent HOC. We simplified the pathway and categorized these HOC as parent HOC, aerobic metabolites, and anaerobic metabolites, as depicted in Figure a.…”

Section: Resultsmentioning

confidence: 99%

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Nonextractable Residues, an Analytical Iceberg, Contribute Significantly to the Pool of Halogenated Organic Chemicals in Soils across Various Regions

Yang,

Liu,

Guo

et al. 2024

Environ. Sci. Technol. Lett.

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The nonextractable residues (NER) of halogenated organic chemicals (HOC), a crucial yet underexplored component in field soil/sediment monitoring, have traditionally been overshadowed by analyses focusing solely on the solvent extractable fraction (EF). This has led to NER-HOC becoming an invisible “analytical iceberg”, with their compositions, levels, and potential risks obscure. Building on our prior research, which revealed distinct distributions of EF-HOC and NER-HOC in industrialized urban and remote permafrost soils, we expanded our study to include suburban soils from both a megacity and a smaller city. Employing solvent extraction and alkaline hydrolysis, we were able to analyze both EF-HOC and NER-HOC. Our findings showed an increased NER-HOC to EF-HOC ratio and a higher prevalence of metabolite HOC compared to parent HOC in areas with reduced anthropogenic impacts. Notably, except for the soils from a point source site, all other locations exhibited NER to EF ratios exceeding 1, indicating a dominance of NER in these HOC pools. This highlights the potential importance for incorporating NER-HOC analysis in soil/sediment monitoring, especially in nonpoint source and remote locations. Our findings contribute to the understanding of the HOC distribution from diverse sources in varying environmental settings and suggest broader NER-HOC analyses in environmental assessments.

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Section: Resultsmentioning

confidence: 99%

“…Distribution of several well-known halogenated organic chemicals (HOC) and their metabolites along their integrated degradation pathways. − (a) The integrated degradation pathways. (b) The concentrations of HOC from different locations.…”

Section: Resultsmentioning

confidence: 99%

Nonextractable Residues, an Analytical Iceberg, Contribute Significantly to the Pool of Halogenated Organic Chemicals in Soils across Various Regions

Yang,

Liu,

Guo

et al. 2024

Environ. Sci. Technol. Lett.

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“…Oxidase enzymes help certain bacterial species use an oxidative coupling process. It detoxifies toxic and resistant chemical substances like DDT and converts them into less harmful ones [119] . Fungi use a biochemical mechanism known as the oxidoreductase biocatalyst to absorb energy from the body.…”

Section: Microbial Enzymes In Ddt Remediationmentioning

confidence: 99%

“…Examples of these enzymes are manganese, lignin, laccase, and peroxidase. Furthermore, as compared to bacteria, fungi could efficiently colonize the soil pollution because of their filamentous structure [119] .…”

Section: Microbial Enzymes In Ddt Remediationmentioning

confidence: 99%

The role and mechanisms of microbes in dichlorodiphenyltrichloroethane (DDT) and its residues bioremediation

Ebsa,

Gizaw,

Admassie

et al. 2024

Biotechnology Reports

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“…Bacteria's role in soil functionality is equally noteworthy, contributing to plant nutrition through organic matter decomposition (Jiao et al, 2021;Li, He, et al, 2021) and engaging in biological nitrogen (N) fixation (Hall, 1909). Moreover, bacteria are instrumental in synthesizing soil humus and degrading pollutants, thus enhancing the soil environment (Kumari & Das, 2023). In addition, specific bacterial metabolites and hormones can inhibit pathogens and foster plant growth (Guo et al, 2022).…”

mentioning

confidence: 99%

Crucial role of rare taxa in preserving bacterial community stability

Ma,

Niu,

et al. 2023

Land Degrad Dev

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Stable bacterial communities are essential for maintaining soil functions. However, the role of abundant and rare bacterial taxa in maintaining bacterial community stability remains controversial. To explore the relationship between abundant and rare taxa and bacterial community stability, we used high‐throughput sequencing technology and molecular ecological networks to characterize the distribution of abundant and rare bacterial taxa under different nitrogen (N) fertilization rates (0, 150, 200, and 250 kg N hm−2). Our findings revealed that rare taxa had much higher Simpson's diversity index values than abundant taxa. Moreover, rare taxa Simpson's diversity decreased with increasing N application, while bacterial community differences (Bray–Curtis distance dissimilarity) increased (i.e., bacterial community stability decreased with increasing N application). The network topology showed that rare sub‐communities had higher modularity and a greater proportion of positive links than abundant taxa. The rare bacterial Simpson's diversity was significantly and negatively correlated with bacterial community differences, no correlation occurred between abundant bacterial Simpson's diversity and bacterial community differences. This study underscores the importance of rare species in maintaining bacterial community stability. Consequently, when optimizing agricultural management practices to ensure the stability of bacterial communities and soil functions, it is crucial not only to concentrate consider the roles of abundant species involved in nutrient cycling but also to give greater consideration to the role of rare taxa.

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Bacterial enzymatic degradation of recalcitrant organic pollutants: catabolic pathways and genetic regulations

Cited by 31 publications

References 212 publications

Nonextractable Residues, an Analytical Iceberg, Contribute Significantly to the Pool of Halogenated Organic Chemicals in Soils across Various Regions

Nonextractable Residues, an Analytical Iceberg, Contribute Significantly to the Pool of Halogenated Organic Chemicals in Soils across Various Regions

The role and mechanisms of microbes in dichlorodiphenyltrichloroethane (DDT) and its residues bioremediation

Crucial role of rare taxa in preserving bacterial community stability

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