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Which of these following enzymes does not take part in pyruvate –dehydrogenase complex?

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Which of these following enzymes does not take part in pyruvate –dehydrogenase complex?

(a) Glyceraldehyde-3 phosphate dehydrogenase

(b) Pyruvate dehydrogenase

(c) Dihydrolipoyl transacetylase

(d) Dihydrolipoyl dehydrogenase

The question was posed to me during an interview.

Question is taken from Respiration topic in section Bioenergetics and Metabolism of Life Sciences

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The correct answer is (a) Glyceraldehyde-3 phosphate dehydrogenase

Easiest explanation: Pyruvate dehydrogenase complex consists of three individual enzymes: E1, E2, and E3, where E1 is pyruvate dehydrogenase, E2 is dihydrolipoyl transacetylase and E3 is dihydrolipoyl dehydrogenase. Oxidation of pyruvate to acetyl-Co-A is done along with coenzymes.

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