Biodegradation of dimethyl terephthalate by Pasteurella multocida Sa follows an alternative biochemical pathway

Jiaxi Li, Ji Dong Gu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Pasteurella multocida Sa, a bacterial strain isolated from mangrove sediment by enrichment technique, was capable of transforming dimethyl terephthalate (DMT). Biodegradation of DMT was shown to take place as a series of sequential steps involving the hydrolysis of two ester linkages between the carboxyl groups of the terephthalate and the methyl side-chain initially to produce mono-methyl terephthalate (MMT) and then terephthalic acid (TA), respectively. However, with ethanol as the carrying solvent, there was a formation of one metabolite previously not observed. The two metabolites were characterized by high performance-liquid chromatography-electron ionization mass spectrometry as MMT and mono-ethyl terephthalate (MET), suggesting the existence of an alternative biochemical pathway in the degradation of DMT by P. multocida Sa. Since the presence of MMT and ethanol in culture inoculated with P. multocida Sa was prerequisites for the formation of MET, biologically mediated trans-esterification was proposed as a mechanism for the novel biochemical process observed.

Original languageEnglish
Pages (from-to)391-397
Number of pages7
JournalEcotoxicology
Volume15
Issue number4
DOIs
StatePublished - May 2006
Externally publishedYes

Keywords

  • Biodegradation
  • Dimethyl terephthalate
  • Esterase
  • Plasticiser
  • Trans-esterification

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