The enzyme glutathione reductase catalyzes the conversion of the molecule GSSG to GSH, which is essential in order for cells to counteract the effects of reactive oxygen species in the cytoplasm. Glutathione reductase cleaves a single disulfide bond within the GSSG molecule, resulting in two GSH molecules. Solely using this given information, how does the oxidation number change from a single GSSG molecule to a single GSH molecule? A.+2 to 0B.+1 to 0C.0 to -1D.0 to -2
Question
The enzyme glutathione reductase catalyzes the conversion of the molecule GSSG to GSH, which is essential in order for cells to counteract the effects of reactive oxygen species in the cytoplasm. Glutathione reductase cleaves a single disulfide bond within the GSSG molecule, resulting in two GSH molecules. Solely using this given information, how does the oxidation number change from a single GSSG molecule to a single GSH molecule? A.+2 to 0B.+1 to 0C.0 to -1D.0 to -2
Solution
The oxidation number changes from +2 to 0. So, the correct answer is A. +2 to 0. This is because the disulfide bond in GSSG is reduced (gain of electrons) to form two GSH molecules, thus decreasing the oxidation number.
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