Water
The electrons stripped from glucose first end up forming oxygen as cellular respiration proceeds with the electron transport chain (step). Eventually, the oxygen is combined with the hydrogen ions initially released or split from glucose by the dehydrogenase enzyme. The reaction between oxygen and hydrogen ends up forming water.
Answer: The pH dependence is usually due to the side groups of the amino acids. A change in pH changes the protonation pattern and can, in extreme cases, result in protein denaturation. I therefore suspect that your protein stabilizes the enzyme structure, thus keeping it active at sub optimal pH values.
Explanation: Hope this helps :)
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