ATP-bound states of GroEL captured by cryo-electron microscopy

Neil A. Ranson, George W. Farr, Alan M. Roseman, Brent Gowen, Wayne A. Fenton, Arthur L. Horwich, Helen R. Saibil

    Research output: Contribution to journalArticlepeer-review


    The chaperonin GroEL drives its protein-folding cycle by cooperatively binding ATP to one of its two rings, priming that ring to become folding-active upon GroES binding, while simultaneously discharging the previous folding chamber from the opposite ring. The GroEL-ATP structure, determined by cryo-EM and atomic structure fitting, shows that the intermediate domains rotate downward, switching their intersubunit salt bridge contacts from substrate binding to ATP binding domains. These observations, together with the effects of ATP binding to a GroEL-GroES-ADP complex, suggest structural models for the ATP-induced reduction in affinity for polypeptide and for cooperativity. The model for cooperativity, based on switching of intersubunit salt bridge interactions around the GroEL ring, may provide general insight into cooperativity in other ring complexes and molecular machines.
    Original languageEnglish
    Pages (from-to)869-879
    Number of pages10
    Issue number7
    Publication statusPublished - 28 Dec 2001


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