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• W3117347221 abstract "Abstract The cutinase‐like enzyme from the thermophile Saccharomonospora viridis AHK190, Cut190, is a good candidate to depolymerize polyethylene terephthalate (PET) efficiently. We previously developed a mutant of Cut190 (S226P/R228S), which we designated as Cut190* that has both increased activity and stability and solved its crystal structure. Recently, we showed that mutation of D250C/E296C on one of the Ca 2+ ‐binding sites resulted in a higher thermal stability while retaining its polyesterase activity. In this study, we solved the crystal structures of Cut190* mutants, Q138A/D250C‐E296C/Q123H/N202H, designated as Cut190*SS, and its inactive S176A mutant, Cut190*SS_S176A, at high resolution. The overall structures were similar to those of Cut190* and Cut190*S176A reported previously. As expected, Cys250 and Cys296 were closely located to form a disulfide bond, which would assuredly contribute to increase the stability. Isothermal titration calorimetry experiments and 3D Reference Interaction Site Model calculations showed that the metal‐binding properties of the Cut190*SS series were different from those of the Cut190* series. However, our results show that binding of Ca 2+ to the weak binding site, site 1, would be retained, enabling Cut190*SS to keep its ability to use Ca 2+ to accelerate the conformational change from the closed (inactive) to the open (active) form. While increasing the thermal stability, Cut190*SS could still express its enzymatic function. Even after incubation at 70°C, which corresponds to the glass transition temperature of PET, the enzyme retained its activity well, implying a high applicability for industrial PET depolymerization using Cut190*SS." @default.
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• W3117347221 date "2020-12-24" @default.
• W3117347221 modified "2023-10-17" @default.
• W3117347221 title "Structural basis of mutants of <scp>PET</scp>‐degrading enzyme from <i>Saccharomonospora viridis</i><scp>AHK190</scp> with high activity and thermal stability" @default.
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• W3117347221 doi "https://doi.org/10.1002/prot.26034" @default.
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