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Underlying Role of Hydrophobic Environments in Tuning Metal Elements for Efficient Enzyme Catalysis
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Cited 6 time in Scopus
- Authors
- Issue Date
- 2023-03
- Publisher
- American Chemical Society
- Citation
- Journal of the American Chemical Society, Vol.145 No.10, pp.5880-5887
- Abstract
- The catalytic functions of metalloenzymes are often strongly correlated with metal elements in the active sites. However, dioxygen-activating nonheme quercetin dioxygenases (QueD) are found with various first-row transition-metal ions when metal swapping inactivates their innate catalytic activity. To unveil the molecular basis of this seemingly promiscuous yet metal specific enzyme, we transformed manganese-dependent QueD into a nickel-dependent enzyme by sequence-and structure-based directed evolution. Although the net effect of acquired mutations was primarily to rearrange hydrophobic residues in the active site pocket, biochemical, kinetic, X-ray crystallographic, spectroscopic, and computational studies suggest that these modifications in the secondary coordination spheres can adjust the electronic structure of the enzyme-substrate complex to counteract the effects induced by the metal substitution. These results explicitly demonstrate that such noncovalent interactions encrypt metal specificity in a finely modulated manner, revealing the underestimated chemical power of the hydrophobic sequence network in enzyme catalysis.
- ISSN
- 0002-7863
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