Which elongation factor uses energy provided by the hydrolysis of GTP to move the ribosome along the mRNA during translocation (in Prokaryotes)?
Question
Which elongation factor uses energy provided by the hydrolysis of GTP to move the ribosome along the mRNA during translocation (in Prokaryotes)?
Solution
The elongation factor that uses energy provided by the hydrolysis of GTP to move the ribosome along the mRNA during translocation in Prokaryotes is known as Elongation Factor G (EF-G).
Here are the steps of how it works:
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After the formation of the peptide bond, the A site of the ribosome holds the growing polypeptide chain, while the P site holds an uncharged tRNA molecule. The E site is empty.
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EF-G, bound to GTP, binds to the ribosome. This causes a conformational change in the ribosome, moving the tRNAs into the P and E sites. The A site is now empty and ready to accept a new tRNA.
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The hydrolysis of GTP to GDP provides the energy for this translocation step.
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EF-G, now bound to GDP, is released from the ribosome.
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The ribosome is now ready for the next cycle of elongation.
This process continues until a stop codon is reached, at which point the process of termination begins.
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