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Planta

, Volume 240, Issue 6, pp 1225–1236 | Cite as

First laccase in green algae: purification and characterization of an extracellular phenol oxidase from Tetracystis aeria

  • Benjamin OttoEmail author
  • Dietmar Schlosser
Original Article

Abstract

Main conclusion

A green algal phenol oxidase was firstly purified, confirmed to be a laccase, and a hetero-oligomeric quaternary structure is suggested. The operation of a laccase-mediator system is firstly described in algae.

Laccases (EC 1.10.3.2) catalyze the oxidation of a multitude of aromatic substrates. They are well known in higher plants and fungi, while their presence in green algae appears uncertain. Extracellular laccase-like enzyme activity has previously been described in culture supernatants of the green soil alga Tetracystis aeria [Otto et al. in Arch Microbiol 192:759–768, (2010)]. As reported herein, the T. aeria enzyme was purified 120-fold by employing a combination of anion exchange and size exclusion chromatography. The purified enzyme was confirmed to be a laccase according to its substrate specificity. It oxidizes 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), syringaldazine, and 2,6-dimethoxyphenol (pH optima of pH ≤2.5, 7.0, and 6.5; K m values of 28.8, 40.5, and 1,830 µM; respectively), but not l-tyrosine or Fe2+. ABTS is by far the most efficient substrate. Two polypeptides, A (~110 kDa) and B (71 kDa), were co-purified by the applied procedure, both being highly N-glycosylated (≥~53 and ≥27 %, respectively). As suggested by various gel electrophoretic analyses, the native enzyme (apparent molecular mass of ~220 kDa) most probably is a hetero-oligomer with the composition AB 2 , wherein A is the catalytic subunit and B forms a disulfide-linked homo-dimer B 2 . The decolorization of anthraquinone (Acid Blue 62 and Remazol Brilliant Blue R) and diazo dyes (Reactive Black 5) was studied in the presence of redox-mediating compounds (ABTS and syringaldehyde), demonstrating the operation of the laccase-mediator system in algae for the first time. Thus, laccases from green algae may participate in the biotransformation of a wide spectrum of natural and xenobiotic compounds.

Keywords

Laccase Phenol oxidase Algae Dyes Laccase-mediator system Quaternary structure 

Abbreviations

2,6-DMP

2,6-Dimethoxyphenol

(2D) SDS–PAGE

(Two-dimensional) sodium dodecyl sulfate–polyacrylamide gel electrophoresis

ABTS

2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)

ABu62

Acid Blue 62

IEC

Ion exchange chromatography

PNGase F

Peptide-N-glycosidase F

RB5

Reactive Black 5

RBBR

Remazol Brilliant Blue R

SEC

Size exclusion chromatography

Notes

Acknowledgments

We are grateful to Prof. Werner Reisser and Prof. Hauke Harms for their support. This study was sponsored by the Scholarship Programme of the German Federal Environmental Foundation (DBU; Grant no. 20010/078). The research topic Chemicals in the Environment (CITE) of the Helmholtz Centre for Environmental Research—UFZ provided additional resources for this research.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Institute of Biology, General and Applied BotanyLeipzig UniversityLeipzigGermany
  2. 2.Department of Environmental MicrobiologyHelmholtz Centre for Environmental Research-UFZLeipzigGermany

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