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    Cell. 2003 Jun 13;113(6):789-801.

    Study of the structural dynamics of the E coli 70S ribosome using real-space refinement.

    Gao H, Sengupta J, Valle M, Korostelev A, Eswar N, Stagg SM, Van Roey P, Agrawal RK, Harvey SC, Sali A, Chapman MS, Frank J.

    Howard Hughes Medical Institute, Health Research, Inc, Empire State Plaza, Albany, NY 12201, USA.

    Cryo-EM density maps showing the 70S ribosome of E. coli in two different functional states related by a ratchet-like motion were analyzed using real-space refinement. Comparison of the two resulting atomic models shows that the ribosome changes from a compact structure to a looser one, coupled with the rearrangement of many of the proteins. Furthermore, in contrast to the unchanged inter-subunit bridges formed wholly by RNA, the bridges involving proteins undergo large conformational changes following the ratchet-like motion, suggesting an important role of ribosomal proteins in facilitating the dynamics of translation.

    PMID: 12809609 [PubMed - indexed for MEDLINE]

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