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Flexibility of GroES mobile loop is required for efficient chaperonin function.

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Area of Science:

  • Molecular Biology
  • Protein Folding
  • Biochemistry

Background:

  • Chaperonin GroEL and its cofactor GroES facilitate protein folding via an ATP-dependent mechanism.
  • GroES possesses a flexible "mobile loop" crucial for binding GroEL and forming a cage for protein folding.

Purpose of the Study:

  • To investigate the role of GroES mobile loop flexibility in the efficiency of protein folding.
  • To determine how substrate binding affinity to GroEL influences the importance of loop flexibility.

Main Methods:

  • Disulfide cross-linking was used to restrict the flexibility of the GroES mobile loop.
  • Substrate proteins with engineered high-affinity binding to GroEL (using SBP sequences) were created.
  • The efficiency of assisted folding was assessed under conditions of restricted loop flexibility and varying substrate affinity.

Main Results:

  • Restricting mobile loop flexibility led to inefficient formation of the GroEL-polypeptide-GroES complex and reduced folding efficiency.
  • Increased substrate binding affinity to GroEL amplified the negative impact of reduced loop flexibility on folding.
  • Mobile loop flexibility is essential for GroES to effectively bind GroEL when occupied by substrates with diverse binding modes.

Conclusions:

  • The flexibility of the GroES mobile loop is critical for efficient in-cage protein folding.
  • The contribution of loop flexibility to folding efficiency is directly correlated with substrate binding affinity to GroEL.