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Related Experiment Videos

Chaperonins

N A Ranson1, H E White, H R Saibil

  • 1Department of Crystallography, Birkbeck College London, Malet Street, London WC1E 7HX, U.K.n.ranson@mail.cryst.bbk.ac.uk

The Biochemical Journal
|July 11, 1998
PubMed
Summary
This summary is machine-generated.

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Molecular chaperones like E. coli GroEL and GroES facilitate protein folding using an ATP-dependent cycle. This system binds, encapsulates, and releases proteins, refolding them through conformational changes.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Folding

Background:

  • Molecular chaperones are essential for protein homeostasis, assisting in folding, transport, and degradation.
  • The chaperonin family, including E. coli GroEL, are large oligomeric proteins that encapsulate substrates for folding.
  • GroEL functions with its co-protein GroES in an ATP-dependent manner to refold non-native polypeptides.

Purpose of the Study:

  • To elucidate the mechanism of protein refolding mediated by the GroEL/GroES chaperonin system.
  • To understand the role of ATP binding and hydrolysis in the chaperonin-assisted folding cycle.

Main Methods:

  • Investigated the structural and mechanistic aspects of the Escherichia coli GroEL chaperonin.
  • Detailed the interaction of GroEL with its co-protein GroES and non-native polypeptides.

Related Experiment Videos

  • Analyzed the ATP-dependent ATPase cycle and its effect on substrate binding and release.

    • Main Results:

    • The GroEL/GroES system acts as a molecular container, facilitating protein refolding.
    • The ATPase cycle induces conformational changes, alternating the substrate-binding surface between hydrophobic and hydrophilic states.
    • ATP binding, not hydrolysis, is critical for initiating folding within the GroEL/GroES chamber and for releasing GroES.

    Conclusions:

    • The GroEL/GroES chaperonin system employs a sophisticated ATP-driven mechanism to assist protein folding.
    • Conformational dynamics regulated by ATP binding and hydrolysis are key to the chaperonin's function.
    • Misfolded proteins can undergo multiple rounds of chaperonin interaction for successful refolding.