During the oxidation of glyceraldehyde-3-phosphate, what intermediate in the enzyme-catalyzed mechanism actually undergoes oxidation?

Question

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In the enzyme-catalyzed mechanism of glyceraldehyde-3-phosphate dehydrogenase, the thiohemiacetal intermediate is formed when the aldehyde group of glyceraldehyde-3-phosphate reacts with a cysteine residue in the enzyme. This thiohemiacetal is then oxidized to form a thioester intermediate.

During the Oxidation of Glyceraldehyde-3-Phosphate, What Intermediate in the Enzyme-Catalyzed