Question

Describe an experiment that shows that GTP hydrolysis precedes translocation.

    Describe an experiment that shows that GTP hydrolysis precedes translocation.

Molecular Biology

Molecular Biology

Robert F. Weaver 5th Edition

Chapter 18, Problem 17

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Step 1

Step 1: **Define the Objective** The objective of the experiment is to demonstrate that GTP hydrolysis by the ribosome's elongation factor precedes the translocation of tRNA and mRNA during protein synthesis. Show more…

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Describe an experiment that shows that GTP hydrolysis precedes translocation.

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Key Concepts

GTP Hydrolysis

GTP hydrolysis is the enzymatic conversion of GTP to GDP and inorganic phosphate, releasing energy that is critical for driving conformational changes in cellular machinery. In the context of translation, this reaction provides the energy needed to initiate movements such as translocation.

Translocation

Translocation is the process by which the ribosome moves along the mRNA strand during protein synthesis, ensuring that the next codon is positioned in the decoding center of the ribosome. This step is essential for the sequential addition of amino acids to the growing polypeptide chain.

Kinetic Analysis

Kinetic analysis involves measuring the rates and sequence of biochemical reactions in real time, often utilizing techniques like stopped-flow experiments. This approach is vital in determining the order of events, such as confirming that GTP hydrolysis happens before the translocation step in protein synthesis.

Non-hydrolyzable GTP Analogs

Non-hydrolyzable GTP analogs are modified molecules that can bind to GTPase enzymes but are resistant to hydrolysis. Their use in experiments helps to elucidate the role of GTP hydrolysis by demonstrating that when hydrolysis is blocked, subsequent steps, such as translocation, do not occur.

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