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Destabilization of the complete protein secondary structure on binding to the chaperone GroEL

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Abstract

PROTEIN folding in vivo is mediated by helper proteins, the molecular chaperones1–3, of which Hsp60 and its Escherichia coli variant GroEL are some of the best characterized. GroEL is an oligomeric protein with 14 subunits each of Mr 60K4–6, which possesses weak, co-operative ATPase activity7–9> and high plasticity10. GroEL seems to interact with non-native proteins, binding one or two molecules per 14-mer11–19 in a 'central cavity'20, but little is known about the conformational state of the bound polypeptides. Here we use nuclear magnetic resonance techniques to show that the interaction of the small protein cyclophilin21,22 with GroEL is reversible by temperature changes, and all amide protons in GroEL-bound cyclophilin are exchanged with the solvent, although this exchange does not occur in free cyclophilin. The complete secondary structure of cyclophilin must be disrupted when bound to GroEL.

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Authors and Affiliations

  1. Max-Planck-lnstitut fur Biochemie, Protein Engineering Group, Am Kiopferspitz, D-82152, Martinsried, Germany

    Ralph Zahn & Andreas Plückthun

  2. Institut für Molekularbiologie und Biophysik, ETH-Hönggerberg, CH-8093, Zürich, Switzerland

    Claus Spitzfaden, Marcel Ottiger & Kurt Wüthrich

  3. To whom correspondence should be addressed at: Biochem. Institut, Universität Zurich, Winterthurerstr. 190, CH-8057, Zürich, Switzerland

    Andreas Plückthun

Authors
  1. Ralph Zahn
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  2. Claus Spitzfaden
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  3. Marcel Ottiger
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  4. Kurt Wüthrich
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  5. Andreas Plückthun
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Zahn, R., Spitzfaden, C., Ottiger, M. et al. Destabilization of the complete protein secondary structure on binding to the chaperone GroEL. Nature 368, 261–265 (1994). https://doi.org/10.1038/368261a0

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  • DOI: https://doi.org/10.1038/368261a0

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