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• W647422481 abstract "Laccases are particularly promising enzymes for biotechnology and bioremediation purposes. They are among the most effective enzymes capable of catalyzing the degradation of phenolic compounds with poor water solubility. The technological utility of lacasses can be enhanced greatly by their use in ionic liquids rather than in conventional organic solvents or in their natural aqueous reaction media. In the current study, a laccase from Bacillus HR03 has been engineered through a semi rational method. By screening a library of 450 clones, Glu188Tyr and Glu188Phe showed a distinct improvement in thermal stability and ionic liquid tolerance. In comparison with the wild type, selected mutants exhibited higher kcat/Km against ABTS in the imidazolium based ionic liquids, (1-ethyl-3-methyl imidazolium chloride [EMIm][Cl], butyl-3-methyl imidazolium chloride [BMIm][Cl] and hexyl-3-methyl imidazolium chloride [HMIm][Cl]). Glu188Tyr had a catalytic efficiency, two times greater when compared to the wild type in [HMIm][Cl]. Far-UV circular dichroism (CD) exhibited no significant changes in the secondary structure of the mutants and wild type. Glu188Tyr revealed a more compact structure using Near-UV CD and fluorescence spectroscopy that could account for its high thermal stability. According to bioinformatic analysis, π-π and anion-π interactions played the dominant role in stabilizing both variants." @default.
• W647422481 created "2016-06-24" @default.
• W647422481 creator A5031973409 @default.
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• W647422481 date "2015-08-01" @default.
• W647422481 modified "2023-09-24" @default.
• W647422481 title "A semi-rational approach to obtain an ionic liquid tolerant bacterial laccase through π-type interactions" @default.
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• W647422481 doi "https://doi.org/10.1016/j.ijbiomac.2015.06.002" @default.
• W647422481 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26054663" @default.
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