Movie 1.
This movie depicts a ratchet-like rearrangement of the 70S ribosome. The rotation of the 30S ribosomal subunit relative to the 50S subunit shows high correspondence to motion captured in cryo-EM maps of the ribosome and postulated to be a key mechanical step in the translocation of the mRNA•tRNAs complex. The normal mode representing this motion provides near-atomic-level annotation of this functional rearrangement. Displayed in the movie are important displacements occurring during the ratchet-like rotation shown from a number of perspectives.