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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
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Inter-ring communication allows the GroEL chaperonin complex to distinguish between different substrates.

Esther van Duijn1, Albert J R Heck, Saskia M van der Vies

  • 1Department of Biochemistry and Molecular Biology, Faculty of Sciences, Free University, Amsterdam, The Netherlands.

Protein Science : a Publication of the Protein Society
|April 26, 2007
PubMed
Summary

The GroEL chaperonin complex differentiates protein substrates using inter-ring communication, with substrate size influencing binding. This mechanism allows GroEL to selectively bind and fold proteins, unlike the single-ring SR1 chaperonin.

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Area of Science:

  • Molecular biology
  • Protein folding
  • Biochemistry

Background:

  • The GroEL chaperonin complex, composed of two heptameric rings, facilitates protein folding in Escherichia coli.
  • Inter-ring communication within GroEL is crucial for substrate and co-chaperonin interaction, but molecular details remain unclear.

Purpose of the Study:

  • To investigate how substrate binding affects inter-ring communication in the GroEL chaperonin complex.
  • To compare the substrate binding and communication mechanisms of the double-ring GroEL and single-ring SR1 chaperonins.

Main Methods:

  • Utilized mass spectrometry to analyze GroEL and SR1 chaperonin complexes with four different substrates.
  • Employed gas-phase collision-induced dissociation to probe differences in chaperonin-substrate complexes.

Main Results:

  • GroEL distinguishes between substrates (Rubisco, gp23, gp5, MDH), unlike SR1.
  • Rubisco binds to only one GroEL ring, while gp23, gp5, and MDH bind to both rings simultaneously.
  • Substrate size significantly impacts the stabilization of the GroEL chaperonin complex.

Conclusions:

  • Inter-ring communication in GroEL enables substrate differentiation.
  • The size of the substrate is a key determinant in the stabilization of the chaperonin complex.