Abstract
A gene encoding a novel extracellular subtilisin-like protease was cloned from the ascomycete Fusarium equiseti and expressed in Trichoderma reesei. The F. equiseti protease (Fe protease) showed excellent performance in stain removal and good compatibility with several commercial laundry detergent formulations, suggesting that it has high potential for use in various industrial applications. The recombinant enzyme was purified and characterized. The temperature optimum of the Fe protease was 60 °C and it showed high activity in the pH range of 6–10, with a sharp decline in activity at pH above 10. The amino acid specificity of the Fe protease was studied using casein, cytochrome c, and ubiquitin as substrates. The Fe protease had broad substrate specificity: almost all amino acid residues were accepted at position P1, even though it showed some preference for cleavage at the C-terminal side of asparagine and histidine residues. The S4 subsite of Fe protease favors aspartic acid and threonine. The other well-characterized proteases from filamentous fungi, Proteinase K from Engyodontium album, Thermomycolin from Malbranchea sulfurea, and alkaline subtilisins from Bacillus species prefer hydrophobic amino acids in both the S1 and S4 subsites. Due to its different specificity compared to the members of the S8 family of clan SB of proteases, we consider that the Fe protease is a new protease. It does not belong to any previously defined IUBMB groups of proteases.
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The authors wish to thank Gunilla Rönnholm of the Institute of Biotechnology in Helsinki for her contribution on determination of the peptide sequences. The authors are grateful to Karl-Heinz Maurer for critically reviewing the manuscript.
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Juntunen, K., Mäkinen, S., Isoniemi, S. et al. A New Subtilase-Like Protease Deriving from Fusarium equiseti with High Potential for Industrial Applications. Appl Biochem Biotechnol 177, 407–430 (2015). https://doi.org/10.1007/s12010-015-1752-6
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DOI: https://doi.org/10.1007/s12010-015-1752-6