Reactive Human Plasma Glutathione Peroxidase Mutant with Diselenide Bond Succeeds in Tetramer Formation.

ABSTRACT: Plasma glutathione peroxidase (GPx3) belongs to the GPx superfamily, and it is the only known secreted selenocysteine (Sec)-containing GPx in humans. It exists as a glycosylated homotetramer and catalyzes the reduction of hydrogen peroxide and lipid peroxides, depending on the Sec in its active center. In this study, a previously reported chimeric tRNA^UTuT6 was used for the incorporation of Sec at the UAG amber codon, and the mature form of human GPx3 (hGPx3) without the signal peptide was expressed in amber-less E. coli C321.ΔA.exp. Reactive Sec-hGPx3, able to reduce H₂O₂ and tert-butyl hydroperoxide (t-BuOOH), was produced with high purity and yield. Study of the quaternary structure suggested that the recombinant Sec-hGPx3 contained an intr

SUBMITTER: Fan Z 

PROVIDER: S-EPMC9220127 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature