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Chapter 23: Q14 P (page 1085)

\(\alpha \)-Keto acids other than \(\alpha \) -ketoglutarate can accept the amino group from pyridoxamine in enzyme catalyzed transamination reactions. What amino acids are formed when the following a-keto acids accept the amino group?

Short Answer

Expert verified

\(\alpha \) -keto group of pyruvate and oxaloacetate converts to corresponding amino acid by treating with pyridoxamine and reducing agent. Synthesized amino acids from\(\alpha \)-keto acids are shown below

  1. From pyruvate:
  2. From oxaloacetate

Step by step solution

01

Synthesis of alanine from pyruvate

\(\alpha \) -keto group of pyruvate accepts amino group from pyridoxamine is converted to an amino group. This conversion is done by pyridoxamine and reducing agent produces an\(\alpha \)s-amino acid called alanine.

02

Synthesis of aspartate from oxaloacetate

伪-keto group of oxaloacetate converts to an \(\alpha \) -amino acid called aspartate in the presence of pyridoxamine and Pd/H2 reducing agent.

Thus, the given 伪-keto acids are converted to corresponding amino acid is shown above.

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Most popular questions from this chapter

Question:Thiols such as ethanethiol and propanethiol can be used to reduce vitamin K epoxide to vitamin KH2, but they react much more slowly than dihydrolipoate. Explain why this is so.

Propose a mechanism for the 伪,尾-elimination reaction shown on page 1082.

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.

Nonenzyme-bound FAD is a stronger oxidizing agent than NAD+. How, then, can NAD+oxidize the reduced flavoenzyme in the pyruvate dehydrogenase

complex?
See all solutions

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