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Biochemistry

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Amino Acids, Proteins and Porphyrins

Question
15 out of 36
 

Which of the following is required for transfer of amino group? (AIPG 2011)



A Transferase
B Oxidase

C Transaminase
D Anhydrase

Ans. C Transaminase. (Ref. Harper biocheistry 26th/pg. 135)

Aminotransferase (transaminase) reactions form:

a. Pyruvate from alanine,

b. Oxaloacetate from aspartate, and

c. α-ketoglutarate from glutamate.

Because these reactions are reversible, the cycle also serves as a source of carbon skeletons for the synthesis of these amino acids.

Other amino acids contribute to gluconeogenesis because their carbon skeletons give rise to citric acid cycle intermediates.

a. Alanine, cysteine, glycine, hydroxyproline, serine, threonine, and tryptophan yield pyruvate;

b. Arginine, histidine, glutamine, and proline yield α-ketoglutarate;

c. Isoleucine, methionine, and valine yield succinyl-CoA; and

d. Tyrosine and phenylalanine yield fumarate.

Amino Acids, Proteins and Porphyrins Flashcard List

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