Genome search of Geobacillus thermopakistaniensis, formerly Geobacillus sp. SBS-4S, revealed the presence of an open reading frame (ESU71923) annotated as laccase. However, the gene product did not display any laccase-like activity against the substrates examined. The laccase activity was, therefore, purified from G. thermopakistaniensis cells and N-terminal amino acid residues of the enzyme were determined. These residues matched the N-terminal sequence of an open reading frame annotated as a copper oxidase (ESU72270). In order to characterize the enzyme, recombinant ESU72270 was prepared in Escherichia coli. The recombinant protein was found to exhibit a negligible amount of laccase activity when produced in the absence of copper in the growth medium. However, the recombinant protein exhibited significantly high laccase activity when produced in the presence of copper. The recombinant enzyme showed highest activity at 60 °C and a pH of 7–7.5. The purified enzyme was highly tolerant to various halides and organic solvents, thus having a potential for various industrial applications. To the best of our knowledge, this is the first characterization of a laccase from genus Geobacillus which identifies a gene responsible for functional laccase in this genus.
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Basheer, S., Rashid, N., Ashraf, R. et al. Identification of a novel copper-activated and halide-tolerant laccase in Geobacillus thermopakistaniensis . Extremophiles 21, 563–571 (2017). https://doi.org/10.1007/s00792-017-0925-3
- Geobacillus thermopakistaniensis
- Copper oxidase