Question

What is the role of ATP in amino acid activation?

   What is the role of ATP in amino acid activation?

Biochemistry

Mary K. Campbell,… 8th Edition

Chapter 12, Problem 15

Instant Answer

Solved by Expert Sam Limsuwannarot

06/18/2020

Step 1

ATP, or Adenosine Triphosphate, is a molecule that carries energy within cells. It is the main energy currency of the cell, and it is an end product of the processes of photophosphorylation (adding a phosphate group to a molecule using energy from light), cellular Show more…

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Key Concepts

ATP as an Energy Source

ATP acts as the primary energy currency in cells, providing the necessary energy to drive endergonic reactions. In the context of amino acid activation, energy released from ATP hydrolysis is used to overcome the activation energy barrier for attaching an amino acid to its corresponding tRNA, ensuring the process proceeds efficiently in a cellular environment.

Amino Acid Activation Process

Amino acid activation is the initial step in protein synthesis where amino acids are attached to their specific tRNAs. This process involves the formation of a high-energy intermediate that links the carboxyl group of an amino acid to an adenosine monophosphate (AMP) moiety, made possible by the hydrolysis of ATP.

Formation of Aminoacyl Adenylate Intermediate

During amino acid activation, ATP is used to form an aminoacyl adenylate intermediate. This intermediate, a high-energy compound, is crucial because it primes the amino acid for subsequent transfer to its corresponding tRNA, thereby establishing a key step in ensuring the fidelity of protein synthesis.

Enzymatic Catalysis by Aminoacyl-tRNA Synthetases

Aminoacyl-tRNA synthetases are specialized enzymes that catalyze the attachment of amino acids to their respective tRNAs. They facilitate the hydrolysis of ATP to AMP and PPi, using the released energy to drive the formation of the aminoacyl adenylate intermediate, which is essential for the activation and proper loading of the tRNA with the correct amino acid.

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