4.8 Article

Genome, metabolic pathways and characteristics of cometabolism of dibenzothiophene and the biodiesel byproduct glycerol in Paraburkholderia sp. C3

Journal

BIORESOURCE TECHNOLOGY
Volume 326, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124699

Keywords

Biodegradation; Dibenzothiophene; Genome sequence; Glycerol

Funding

  1. National Natural Science Foundation of China [31500034, 32071302]
  2. Postdoctoral Innovative Talent Support Program [BX20190008]
  3. China Postdoctoral Science Foundation [2019M660335]
  4. USDA [HAW5032-R]
  5. China Scholarship Council scholarship

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The study showed a direct association between rhamnolipids biosynthesis and DBT biodegradation induced by different carbon sources in a Paraburkholderia specie. Glycerol can induce the strain C3 to produce at least four rhamnolipids, suggesting a viable approach of using the biodiesel byproduct to remediate contaminated environments.
Utilization of glycerol, a biodiesel byproduct, has not been well explored. In the present study, glycerol and the other carbon sources were studied for cometabolism of dibenzothiophene (DBT), a model chemical commonly used in bioremediation studies, by Paraburkholderia sp. C3. This study showed a direct association between rhamnolipids (RLs) biosynthesis and DBT biodegradation induced by different carbon sources in a Paraburkholderia specie. Glycerol can induce the strain C3 produce at least four RLs. The RL precursor is mainly derived from the fatty acid synthesis (FAS II) and beta-oxidation pathway. The genome contained two (fabF and fabG) and four (fadA, fadE, fadB and echA) genes involved in FAS II and beta-oxidation, respectively. The genome also carried the rhIA and rhiB genes involved in rhamnosyltransferase for RL biosynthesis and two DBT dioxygenase genes (nahAc and catA). The findings suggest a viable approach of using the biodiesel byproduct glycerol to remediate contaminated environments.

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