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The Quiescin-sulfhydryl oxidase (QSOX) family of flavoenzymes catalyzes the direct and facile insertion of disulfide bonds into unfolded reduced proteins with concomitant reduction of oxygen to hydrogen peroxide. This review discusses the chemical mechanism of these enzymes and the involvement of...
The Erv flavoenzymes contain a compact module that catalyzes the pairing of cysteine thiols into disulfide bonds. High-resolution structures of plant, animal, and fungal Erv enzymes that function in different contexts and intracellular compartments have been determined. Structural features can be...