Abstract
Effects of a water-miscible organic solvent, methanol, on the structure and activity of halophilic β-lactamase derived from Chromohalobacter sp.560 (HaBla), were investigated by means of circular dichroism (CD) measurement and enzymatic activity determination. Beta-lactamase activity was enhanced about 1.2-fold in the presence of 10–20% methanol. CD measurement of HaBla revealed different structures depending on the methanol concentration: native-like active form (Form I) in 10–20% methanol and methanol-induced inactive form at higher concentration (Form II in 40–60% and Form III in 75–80% methanol). Incubation of HaBla with 40% methanol led to the complete loss of activity within ~80 min accompanied by the formation of Form II, whose activity was recovered promptly up to ~80% of full activity upon dilution of the methanol concentration to 10%. In addition, when the protein concentration was sufficiently high (e.g., 0.7 mg/ml), HaBla activity of Form III in 75% methanol could be recovered in the same way (with slightly slower recovery rate), upon dilution of the methanol concentration. In contrast, non-halophilic β-lactamase from Escherichia coli K12 strain MG1655 (EcBla) was irreversibly denatured in the presence of 40% methanol. HaBla showed remarkable ability to renature from the methanol-induced inactive states.
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Abbreviations
- SDS-PAGE:
-
SDS-polyacrylamide gel electrophoresis
- CD:
-
Circular dichroism
- HaBla:
-
Halophilic β-lactamase
- EcBla:
-
E.coli β-lactamase
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Acknowledgements
The authors wish to acknowledge Dr. S. Arai for fruitful discussion. We also thank Drs. H. Onishi, M. Mizukami, H. Hanagata, and A. Miyauchi for helpful discussions on Brevibacillus expression.
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Tokunaga, H., Maeda, J., Arakawa, T. et al. Reversible Activation of Halophilic β-lactamase from Methanol-Induced Inactive Form: Contrast to Irreversible Inactivation of Non-Halophilic Counterpart. Protein J 36, 228–237 (2017). https://doi.org/10.1007/s10930-017-9715-0
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DOI: https://doi.org/10.1007/s10930-017-9715-0