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Cresols utilization by Trametes versicolor and substrate interactions in the mixture with phenol

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Abstract

The ability of the white rot fungus Trametes versicolor strain 1 to degrade and utilize methylated phenols (cresols) was established for the first time in a medium not containing any other carbon components. The data obtained demonstrated the better potential of the strain to assimilate p-cresol instead of o- or m- cresol. The 0.5 g/l p-cresol provided was degraded in full after 96 h. The effect of a dual substrate mixture (0.3 g/l phenol + 0.2 g/l p-cresol) on the growth behavior and degradation capacity of the investigated strain was examined. The cell-free supernatants were analyzed by HPLC. It was established that the presence of p-cresol had not prevented complete phenol degradation but had a significant delaying effect on the phenol degradation dynamics. Phenol hydroxylase, catechol 1.2-dioxygenase and cis,cis-muconate cyclase activities were obtained in conditions of single and mixed substrates cultivation. The influence of different phenolic substrates on phenol hydroxylase activity in Trametes versicolor 1 was established. The mathematical models describing the dynamics of single substrates’ utilization as well as the mutual influence of phenol and p-cresol in the mixture were developed on the bases of Haldane kinetics. The estimated interaction coefficients (I ph/cr = 4.72, I cr/ph = 7.46) demonstrated the significant inhibition of p-cresol on phenol biodegradation and comparatively low level of influence of phenol presence on the p-cresol degradation. Molecular 18S RNA gene taxonomy of the investigated strain was performed.

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Acknowledgments

This work was supported by the National Council of Science Research of the Bulgarian Ministry of Education and Science under project N VU-B-207/2006.

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Correspondence to Zlatka Alexieva.

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Alexieva, Z., Yemendzhiev, H. & Zlateva, P. Cresols utilization by Trametes versicolor and substrate interactions in the mixture with phenol. Biodegradation 21, 625–635 (2010). https://doi.org/10.1007/s10532-010-9330-7

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  • DOI: https://doi.org/10.1007/s10532-010-9330-7

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