Abstract
Objectives
To better understand the unique inhibitory behavior of a non-natural cofactor preferred formaldehyde dehydrogenase (FalDH) mutant 9B2.
Results
We described our serendipitous observation that 9B2 was reversibly inhibited by residual imidazole introduced during protein preparation, while the wild-type enzyme was not sensitive to imidazole. Kinetic analysis showed that imidazole was a competitive inhibitor of formaldehyde with a Ki of 16 μM and an uncompetitive inhibitor of Nicotinamide Cytosine Dinucleotide for 9B2, indicating that formaldehyde and imidazole were combined in the same position. Molecular docking results of 9B2 showed that imidazole could favorably bind very close to the nicotinamide moiety of the cofactor, where formaldehyde was expected to reside for catalysis, which was in line with a competitive inhibition.
Conclusion
The mutant 9B2 can be competitively inhibited by imidazole, suggesting that cautions should be taken to evaluate activities as protein mutants might attain unexpected sensitivity to a component in buffers for purification or activity assays.
Graphical abstract
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Data availability
Data will be made available on request.
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Funding
This work was supported by the National Key R&D Program of China (Grand No. 2018YFA0900300); the National Natural Science Foundation of China (Grand Nos. 21907092, 32001028); and Dalian Institute of Chemical Physics, CAS (No. DICP I202020).
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XW developed the idea for the study. XW, ZKZ. conceived the project. JW performed most experiments and drafted the manuscript. LW analyzed the structure and performed the molecular docking. XG helped with experiments. XW, ZKZ, LW, XG, and JW revised the manuscript. All authors contributed to the discussion of results and comments on this paper.
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Wang, J., Wan, L., Guo, X. et al. Competitive inhibition of a non-natural cofactor dependent formaldehyde dehydrogenase by imidazole. Biotechnol Lett 45, 679–687 (2023). https://doi.org/10.1007/s10529-023-03372-0
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DOI: https://doi.org/10.1007/s10529-023-03372-0