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Appl Environ Microbiol. 1993 December; 59(12): 4010-4016
Copyright © 1993, American Society for Microbiology. All Rights Reserved.

Decolorization of Azo, Triphenyl Methane, Heterocyclic, and Polymeric Dyes by Lignin Peroxidase Isoenzymes from Phanerochaete chrysosporium

Pauli Ollikka, Kirsi Alhonmäki, Veli-Matti Leppänen, Tuomo Glumoff, Timo Raijola and Ilari Suominen*

1 Department of Biochemistry, University of Turku, Vatselankatu 2, 20500 Turku, and Turku Centre for Biotechnology, University of Turku, 20520 Turku, 2 Finland

ABSTRACT

The ligninolytic enzyme system of Phanerochaete chrysosporium decolorizes several recalcitrant dyes. Three isolated lignin peroxidase isoenzymes (LiP 4.65, LiP 4.15, and LiP 3.85) were compared as decolorizers with the crude enzyme system from the culture medium. LiP 4.65 (H2), LiP 4.15 (H7), and LiP 3.85 (H8) were purified by chromatofocusing, and their kinetic parameters were found to be similar. Ten different types of dyes, including azo, triphenyl methane, heterocyclic, and polymeric dyes, were treated by the crude enzyme preparation. Most of the dyes lost over 75% of their color; only Congo red, Poly R-478, and Poly T-128 were decolorized less than the others, 54, 46, and 48%, respectively. Five different dyes were tested for decolorization by the three purified isoenzymes. The ability of the isoenzymes to decolorize the dyes in the presence of veratryl alcohol was generally comparable to that of the crude enzyme preparation, suggesting that lignin peroxidase plays a major role in the decolorization and that manganese peroxidase is not required to start the degradation of these dyes. In the absence of veratryl alcohol, the decolorization activity of the isoenzymes was in most cases dramatically reduced. However, LiP 3.85 was still able to decolorize 20% of methylene blue and methyl orange and as much as 60% of toluidine blue O, suggesting that at least some dyes can function as substrates for isoenzyme LiP 3.85 but not to the same extent for LiP 4.15 or LiP 4.65. Thus, the isoenzymes have different specificities towards dyes as substrates.

FOOTNOTES

* Corresponding author. Electronic mail address: ilsuomin@sara.utu.fi.

Appl Environ Microbiol. 1993 December; 59(12): 4010-4016
Copyright © 1993, American Society for Microbiology. All Rights Reserved.



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