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Mutations in the coordination spheres of T1 Cu affect Cu2+-activation of the laccase from Thermus thermophilus

Abstract : Thermus thermophilus laccase belongs to the sub-class of multicopper oxidases that is activated by the extra binding of copper to a methionine-rich domain allowing an electron pathway from the substrate to the conventional first electron acceptor, the T1 Cu. In this work, two key amino acid residues in the 1st and 2nd coordination spheres of T1 Cu are mutated in view of tuning their redox potential and investigating their influence on copper-related activity. Evolution of the kinetic parameters after copper addition highlights that both mutations play a key role influencing the enzymatic activity in distinct unexpected ways. These results clearly indicate that the methionine rich domain is not the only actor in the cuprous oxidase activity of CueO-like enzymes.
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https://hal.archives-ouvertes.fr/hal-03127150
Contributor : Ievgen Mazurenko Connect in order to contact the contributor
Submitted on : Monday, February 1, 2021 - 12:34:20 PM
Last modification on : Tuesday, January 4, 2022 - 6:13:36 AM
Long-term archiving on: : Sunday, May 2, 2021 - 7:13:10 PM

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Romain Clément, Xie Wang, Frédéric Biaso, Marianne Ilbert, Ievgen Mazurenko, et al.. Mutations in the coordination spheres of T1 Cu affect Cu2+-activation of the laccase from Thermus thermophilus. Biochimie, Elsevier, 2021, 182, pp.228-237. ⟨10.1016/j.biochi.2021.01.006⟩. ⟨hal-03127150⟩

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