Separation and purification of laccases from two different fungi using aqueous two-phase extraction

Axel Prinz, Jacqueline Hönig, Ina Schüttmann, Holger Zorn, Tim Zeiner*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Selective purification still poses a challenge in the downstream processing of biomolecules such as proteins and especially enzymes. In this study a polyethylene glycol 3000 (PEG 3000)-phosphate aqueous two-phase system at 25 C and pH 7 was successfully used for laccase purification and separation. Initially, the effect of phase forming components on enzyme activities in homogenous systems was studied. In the course of the extraction experiments tie lines, enzyme source, initial enzyme activities, phase ratio and sodium chloride concentrations were varied and their influence on the activity partitioning was determined. Partitioning results were validated using clear-native-PAGE and isoelectric focusing. Based on these results, the separation of laccases from Trametes versicolor and Pleurotus sapidus was investigated using the principle of superposition. Sodium chloride was used to adjust laccase partitioning in the applied aqueous two-phase system (ATPS). Finally, two modes of operation are proposed depending on the aim of the purification task. One mode with 0.133 g g-1 of PEG3000, 0.063 g g-1 of phosphate and without sodium chloride separates P. sapidus laccases from T. versicolor laccases with clearance factors of 5.23 and 6.45, respectively. The other mode of operation with 0.124 g g-1 of PEG3000, 0.063 g g-1 of phosphate and 0.013 g g-1 of sodium chloride enables a partitioning of both laccases into the bottom phase of the ATPS resulting in a purification factor of 2.74 and 96% activity recovery.

Original languageEnglish
Pages (from-to)335-346
Number of pages12
JournalProcess biochemistry
Volume49
Issue number2
DOIs
Publication statusPublished - Feb 2014

Keywords

  • Aqueous two-phase system
  • Enzyme activity
  • Laccase
  • Separation
  • Superposition

ASJC Scopus subject areas

  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Bioengineering

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