Screening of a beta-cypermethrin-degrading bacterial strain Brevibacillus parabrevis BCP-09 and its biochemical degradation pathway

Biodegradation. 2018 Dec;29(6):525-541. doi: 10.1007/s10532-018-9850-0. Epub 2018 Aug 16.

Abstract

A novel beta-cypermethrin (Beta-CP)-degrading strain isolated from activated sludge was identified as Brevibacillus parabrevis BCP-09 based on its morphological and physio-biochemical characteristics, and 16S rRNA gene analysis. Strain BCP-09 could effectively degrade Beta-CP at pH 5.0-9.0, 20-40 °C, and 10-500 mg L-1 Beta-CP. Under optimal conditions (pH 7.41, 38.9 °C, 30.9 mg L-1 Beta-CP), 75.87% Beta-CP was degraded within 3 days. Beta-CP degradation (half-life, 33.45 h) and strain BCP-09 growth were respectively described using first-order-kinetic and logistic-kinetic models. Seven metabolites were detected by high-performance liquid chromatography and gas chromatography-mass spectrometry- methyl salicylate, catechol, phthalic acid, salicylic acid, 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid, 3-phenoxybenzaldehyde, and 3-phenoxybenzoic acid (3-PBA). The major Beta-CP metabolite, 3-PBA was further degraded into phenol, benzoic acid, and 4-methylhexanoic acid. BCP-09 also degraded aromatic compounds such as phenol, catechol, and protocatechuic acid. Beta-CP appears to be mainly degraded into 3-PBA, which is continuously degraded into smaller benzene or chain compounds. Thus, strain BCP-09 could form a complete degradation system for Beta-CP and might be considered a promising strain for application in the bioremediation of environments and agricultural products polluted by Beta-CP.

Keywords: Beta-cypermethrin; Biodegradation; Brevibacillus parabrevis; Degradation pathway; Metabolites.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzaldehydes / metabolism
  • Benzoates / metabolism
  • Biodegradation, Environmental
  • Brevibacillus / growth & development
  • Brevibacillus / isolation & purification
  • Brevibacillus / metabolism*
  • Catechols / metabolism
  • Hydrogen-Ion Concentration
  • Hydroxybenzoates / metabolism
  • Kinetics
  • Metabolome
  • Phenols / metabolism
  • Phylogeny
  • Pyrethrins / chemistry
  • Pyrethrins / metabolism*
  • Temperature

Substances

  • Benzaldehydes
  • Benzoates
  • Catechols
  • Hydroxybenzoates
  • Phenols
  • Pyrethrins
  • cypermethrin
  • 3-phenoxybenzaldehyde
  • protocatechuic acid
  • 3-phenoxybenzoic acid
  • catechol