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Characterization of a thermostable and solvent-tolerant laccase produced by Streptomyces sp. LAO

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Abstract

Objectives

Decaying wood samples were collected, and actinomycetes were isolated and screened for laccase production. The identity of the efficient laccase-producing isolate was confirmed by using a molecular approach. Fermentation conditions for laccase production were optimized, and laccase biochemical properties were studied.

Results

Based on the 16S rRNA gene sequencing and phylogenetic analysis, the isolate coded as HWP3 was identified as Streptomyces sp. LAO. The time-course study showed that the isolate optimally produced laccase at 84 h with 40.58 ± 2.35 U/mL activity. The optimized physicochemical conditions consisted of pH 5.0, ferulic acid (0.04%; v/v), pine back (0.2 g/L), urea (1.0 g/L), and lactose (1 g/L). Streptomyces sp. LAO laccase was optimally active at pH and temperature of 8.0 and 90 °C, respectively, with remarkable pH and thermal stability. Furthermore, the enzyme had a sufficient tolerance for organic solvents after 16 h of preincubation, with laccase activity > 70%. Additionally, the laccase maintained considerable residual activity after pretreatment with 100 mM of chemical agents, including sodium dodecyl sulphate (69.93 ± 0.89%), ethylenediaminetetraacetic acid (93.1 ± 7.85%), NaN3 (96.28 ± 3.34%) and urea (106.03 ± 10.72%).

Conclusion

The laccase's pH and thermal stability; and robust catalytic efficiency in the presence of organic solvents suggest its industrial and biotechnological application potentials for the sustainable development of green chemistry.

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Data availability

The datasets analyzed in the present study are available from the corresponding author on reasonable request. The nucleotide sequence of the Streptomyces sp. LAO was deposited in NCBI GenBank and could be accessed through the accession number MK290990.

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Acknowledgements

The authors acknowledge the South African Medical Research Council (SAMRC) for financial support.

Funding

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Authors

Contributions

Conceptualization: UN; Methodology: AG and NN; Formal analysis and investigation: NN and TD; Writing—original draft preparation: AG and NN; Writing—review and editing: UN; Resources and Supervision: UN and AO. The authors read and approved the final version of the manuscript for publication.

Corresponding author

Correspondence to Uchechukwu U. Nwodo.

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The authors declare that there is no conflict of interest.

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This article does not contain any studies with human participants or animal experiments.

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Gogotya, A., Nnolim, N.E., Digban, T.O. et al. Characterization of a thermostable and solvent-tolerant laccase produced by Streptomyces sp. LAO. Biotechnol Lett 43, 1429–1442 (2021). https://doi.org/10.1007/s10529-021-03131-z

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  • DOI: https://doi.org/10.1007/s10529-021-03131-z

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