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Chapter 23: Q8P (page 1076)

Draw structures that show the similarity between the decarboxylation of the pyruvate鈥揟PP intermediate and the decarboxylation of a \(\beta \)-keto acid.

Short Answer

Expert verified

Pyruvate decarboxylation is a reaction where a carboxylate group is removed and hydrogen is added. This reaction converts pyruvate to acetyl CoA.

Step by step solution

01

Pyruvate decarboxylation

Pyruvate decarboxylation is a reaction where a carboxylate group is removed and hydrogen is added. This reaction converts pyruvate to acetyl CoA.

02

Beta- keto acid decarboxylation

During this reaction an enol intermediate is formed by proton transfer from the carboxylic acid group to the carbonyl oxygen atom of the ketone. So ketone from in this reaction.

03

Structures showing similarity in decarboxylation of pyruvate and beta- keto acid

In the mechanism of the two above reactions the structures showing similarity are:

Here it can be seen that the electron delocalization is occurring in same manner.

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Most popular questions from this chapter

Explain why the hydrogens of the C-8 methyl group are more acidic than those of the C-7 methyl group.

Acetolactate synthase is another TPP-requiring enzyme. It transfers the acyl group of pyruvate to another molecule of pyruvate, forming acetolactate. This is the first step in the biosynthesis of the amino acids valine and leucine. Propose a mechanism for this reaction.

Question: Do all triacylglycerols have the same number of asymmetric centers?

What are the products of the following reaction?

Acetolactatesynthasetransfers the acyl group of pyruvate to \(\alpha \)-ketobutyrate. This is the first step in the biosynthesis of the amino acid isoleucine. Propose a mechanism for this reaction.
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