Which among the following conversions does not involve dehydrogenase enzyme?

Malic acid to oxaloacetate

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Succinate to fumarate

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Oxaloacetate to citric acid

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Citric acid to alpha ketoglutarate

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Solution

The correct option is C Oxaloacetate to citric acid
A dehydrogenase is an oxidoreductase enzyme that oxidizes a substrate by reducing an electron acceptor which is usually NAD⁺/NADP⁺/FAD.

In TCA cycle, conversion of malic acid to oxaloacetate is carried out by malate dehydrogenase. Succinate dehydrogenase catalyses the conversion of succinate to fumarate.

The conversion of alpha ketoglutarate from citric acid is catalysed by aconitase and isocitrate dehydrogenase. But, the conversion of oxaloacetate to citric acid is catalysed by the enzyme, citrate synthase.

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Refer to the given reaction.

a -Ketoglutaric acid + $N H_{4}^{+}$ + NADPH $G l u t a m a t e - -------- \to d e h y d r o g e n a s e G l u t a m a t e + H_{2} O + N A D P$

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Refer to the given reaction.

a -Ketoglutaric acid + NH4+ + NADPH

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It represents

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