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What drives the conformational change in the ribosome?

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What drives the conformational change in the ribosome?

(a) GTP hydrolysis

(b) AMP hydrolysis

(c) ATP hydrolysis

(d) GDP hydrolysis

I got this question in an online interview.

Origin of the question is Gene Expression topic in chapter Gene Expression of Cell Biology

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The correct answer is (a) GTP hydrolysis

For explanation I would say: The large ribosomal subunit joins the mRNA strand when initiator tRNA is bound and IF3 is displaced. After a large subunit joins the complex, GTP is hydrolyzed to drive the conformational change in the ribosome so as to release IF2.

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