Structure of eEF3 and the mechanism of transfer RNA release from the E-site

Christian Brix Folsted Andersen, T. Becker, M. Blau, M. Anand, M. Halic, B. Balar, T. Mielke, Thomas Boesen, Jan Skov Pedersen, C.M.T. Spahn, T.G. Kinzy, Gregers Rom Andersen, R. Beckmann

    Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

    Abstract

    Elongation factor eEF3 is an ATPase, which, in addition to the two canonical factors eEF1A and eEF2, serves an essential function in the translation cycle of fungi. eEF3 is required for the binding of the aatRNA-eEF1A-GTP ternary complex to the ribosomal A-site and has been suggested to facilitate the clearance of deacyl-tRNA from the E-site. Here, we present the crystal structure of eEF3 showing that it consists of an N-terminal HEAT repeat domain, followed by a four-helix bundle and two ABC-type ATPase domains with a chromo-domain inserted in ABC2. Moreover, we present the cryo-EM structure of the ATP-bound form of eEF3 in complex with the post-translocational state 80S ribosome from yeast. eEF3 uses an entirely new factor binding site near the ribosomal E-site, with the chromodomain stabilizing the ribosomal L1 stalk in an open conformation, thus, allowing tRNA release.
    Original languageEnglish
    JournalNature
    Volume443
    Pages (from-to)663-668
    Number of pages6
    ISSN0028-0836
    Publication statusPublished - 2006

    Keywords

    • translation
    • ABC proteins

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