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Match the cofactors below with their roles in the pyruvate dehydrogenase complex reaction.

Cofactors:
A. Coenzyme A (CoA-SH)
B. NAD+
C. Thiamine pyrophosphate (TPP)
D. FAD
E. Lipoic acid in oxidized form

Roles:
_______ Attacks and attaches to the central carbon in pyruvate.
_______ Oxidizes FADH2.
_______ Accepts the acetyl group from reduced lipoic acid.
_______ Oxidizes the reduced form of lipoic acid.
_______ Initial electron acceptor in oxidation of pyruvate.

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alyssahannon1

Cofactors:
A. Coenzyme A (CoA-SH)
B. NAD+
C. Thiamine pyrophosphate (TPP)
D. FAD
E. Lipoic acid in oxidized form

Roles:
E... Attacks and attaches to the central carbon in pyruvate.
A...Oxidizes FADH2.
C...Accepts the acetyl group from reduced lipoic acid.
D... Oxidizes the reduced form of lipoic acid.
B... Initial electron acceptor in oxidation of pyruvate.
ayfat23

The matching of cofactors with the roles they play in pyruvate dehydrogenase complex reaction is done below:

A. Coenzyme A (CoA-SH) [Oxidizes FADH2.]

B. NAD+   [Initial electron acceptor in oxidation of pyruvate.]

C. Thiamine pyrophosphate (TPP) <>[Accepts the acetyl group from reduced lipoic acid]

D. FAD <>[Oxidizes the reduced form of lipoic acid.]

E. Lipoic acid in oxidized form <> [Attacks and attaches to the central carbon in pyruvate.]

  • A cofactor can be regarded as non-protein chemical compound which is needed to act an enzyme's role as a catalyst.

  • They are considered as "helper molecules"  which assist in biochemical transformations.  Examples are: NAD+, FAD, Thiamine pyrophosphate and others.

Therefore, the cofactor are been matched with their roles above

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