☆ 4.7 Article

Debromination of TetraBromoBisphenol-A (TBBPA) depicting the metabolic versatility of Dehalococcoides

JOURNAL OF HAZARDOUS MATERIALS (2021)

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JOURNAL OF HAZARDOUS MATERIALS
Volume 419, Issue -, Pages -

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ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126408

Keywords

Dehalococcoides mccartyi; Brominated flame retardants; Tetrabromobisphenol-A (TBBPA); Penta-brominated diphenyl ether (penta-BDE); Reductive dehalogenase (RDase)

Categories

Engineering, Environmental Environmental Sciences

Funding

  1. Ng Teng Fong Charitable Founda-tion (NTFCF) [R-302-000-198-720]
  2. Min-istry of Education, Singapore [MOE-000033-01, R302-000-239-114]

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TBBPA, a widely used brominated flame retardant, can be bioremediated by Dehalococcoides mccartyi strain CG1, leading to insights into its versatile dehalogenation capabilities and role in in situ remediation of persistent organic pollutants in the environment.
TetraBromoBisphenol-A (TBBPA) is a widely used brominated flame retardant and an emerging contaminant that has amassed significant environmental impacts. Though there are a few studies that report the bioremediation of TBBPA, there is no direct evidence to suggest a metabolic use of TBBPA as the sole electron acceptor, which offers an advantage in the complete and energy-efficient process of debromination under anaerobic conditions. In this study, Dehalococcoides mccartyi strain CG1 was identified to be capable of utilizing TBBPA as the sole electron acceptor at its maximum soluble concentrations (7.3 mu M) coupled with cell growth. A previously characterized reductive dehalogenase (RDase), PcbA1, and six other RDases of strain CG1 were detected during TBBPA debromination via transcriptional and proteomic analyses. Furthermore, as a commonly co-contaminated brominated flame retardant of TBBPA, penta-BDEs were debrominated synchronously with TBBPA by strain CG1. This study provides deeper insights into the versatile dehalogenation capabilities of D. mccartyi strain CG1 and its role in in situ remediations of persistent organic pollutants in the environment.

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