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    • Publication 2
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    • 2022 2
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    • ACS Sustainable Chemistry & Engineering 2
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    • Wessjohann, L. A. 23
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Cui, H.; Zhang, L.; Yildiz, C. B.; Eltoukhy, L.; Cheng, L.; Jaeger, K.-E.; Schwaneberg, U.; Davari, M. D.; Enzyme hydration: How to retain resistance in ionic liquids ACS Sustainable Chemistry & Engineering 10 15104-15114 (2022) DOI: 10.1021/acssuschemeng.2c04216
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Application of ionic liquids (ILs) as media in biocatalysis has enormous potential for synthesizing valuable compounds and bulk products in pharmaceuticals and bioenergy due to their unique solvent properties such as volatility, flammability, and solubility. However, ILs as reaction media are often limited by poor enzymatic activity and stability in ILs. We printed a comprehensive IL−enzyme interaction map by studying 45 molecular observables of 30 lipase A from Bacillus subtilis (BSLA) variants in four ILs and a substitutional landscape with 1504 BSLA variants. The results demonstrated that the enzyme hydration shell is the deciding and independent factor determining the enzyme’s IL resistance. A universal positive correlation (up to R2 = 0.96 in 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM][TfO]) and R2 = 0.85 in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl)) was verified, and an experimentally derived ranking of amino acid substitutions is summarized in a list to provide benefits for better protein engineering practice. Hydration-guided engineering yielded a supremely tolerant BSLA variant I12R/D34K/A132K with 8.1-fold, 8.6-fold, 6.6-fold, and 4.6-fold improved tolerance toward [BMIM]Cl, [BMIM]Br, [BMIM]I, and [BMIM][TfO], respectively, when compared to the wild-type BSLA. The obtained knowledge provides a lesson learned on forecasting enzyme stability in ILs and simplifies a rational design of the IL-tolerant enzymes.

Publications

Pramanik, S.; Cui, H.; Dhoke, G. V.; Yildiz, C. B.; Vedder, M.; Jaeger, K.-E.; Schwaneberg, U.; Davari, M. D.; How does surface charge engineering of Bacillus subtilis lipase A improve ionic liquid resistance? Lessons learned from molecular dynamics simulations ACS Sustainable Chemistry & Engineering 10 2689-2698 (2022) DOI: 10.1021/acssuschemeng.1c07332
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Biocatalysis in ionic liquids (ILs) gained substantial interest due to solvent properties of the ILs, such as near-zero vapor pressure, high thermal stability, and wide tunability. Enzymes are often not catalytically active in ILs; therefore, understanding and improving enzyme resistance in ILs are essential to enable efficient biocatalysis in ionic liquids. Surface charge engineering has repeatedly been reported to enhance enzyme resistance toward ILs. However, the molecular knowledge about how substitutions to charged amino acids improve enzyme activity in an IL is far from being understood. Here, we report a comprehensive study to provide some principles of how surface charged amino acid substitutions (negatively and positively) strengthen the IL resistance of the Bacillus subtilis lipase A (BSLA) in [BMIM]Cl. Twenty typical BSLA substitutions (ten beneficial and ten nonbeneficial, obtained from the BSLA-SSM library) were studied by molecular dynamics (MD) simulations in the [BMIM]Cl system. The BSLA-IL interaction patterns were printed by analyzing several structural- and solvation-based observables. Lessons learned by analyzing the SSM library of BSLA comprise the following: (i) A general trend was found where both negatively and positively charged substitutions increased the essential water molecules locally at the substitution site, thereby contributing to the overall protein hydration shell. (ii) Electrostatic repulsion of both IL ions and the refined hydration shell are ultimately the two main drivers to enhanced IL resistance. The analysis of 20 BSLA substitutions and the identified common interactions reveals that surface charge engineering is very likely to be a general protein engineering strategy to enhance lipase/enzyme activity in ILs. Moreover, this study also suggests that MD is a valuable technique to screen for beneficial substitutions that repel/recruit surface solvation.

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