Bacillus amyloliquefaciens laccase - From soil bacteria to recombinant enzyme for wastewater decolorization

Nikola Lončar*, Nataša Božić, Josep Lopez-Santin, Zoran Vujčić

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

56 Citations (Scopus)

Abstract

One hundred wild type strains of Bacillus sp. were isolated from industrial and agricultural soil across Serbia and screened for laccase activity. Three strains showed high laccase activity temperature optimum of 65 and 80. °C towards ABTS. A new laccase gene from the strain with highest temperature optimum, namely Bacillus amyloliquefaciens 12B was cloned and expressed in Escherichia coli. Recombinant laccase degraded dye Reactive blue 52 at pH 7.0 and pH 4.0 and at elevated temperature, while fungal laccases was unable to act on this substrate at pH higher than 4.0 and was quickly inactivated at temperatures higher than 45. °C. Degradation of dye was monitored by HPLC-DAD and resulting precipitate was analyzed by FTIR spectroscopy. Single product peak without chromophore was detected in solution, while water insoluble aggregate, presumably dye polymer is formed retaining blue color.

Original languageEnglish
Pages (from-to)177-183
Number of pages7
JournalBioresource Technology
Volume147
DOIs
Publication statusPublished - Nov-2013
Externally publishedYes

Keywords

  • Bacillus amyloliquefaciens
  • Biodegradation
  • Decolorization
  • Laccase

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