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SlideshowReport

A schematic view of ribosome subunit rotational motions, based on crystal structures of ribosomes

Description
a. View from the bottom. 30S subunit (blue) is shown in starting conformation after termination (outlined in red) to a fully rotated conformation seen during elongation (black outline).

b. Side view. During transition to the fully rotated state, tRNAs shift from binding in A/A and P/P sites (30S/50S) to occupying hybrid sites A/P and P/E.

c. Rotation in another plane can move the head domain of the 30S subunit as much as toward the E site.
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