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Structure-guided engineering of protein stability through core hydrophobicity.

Aravind Ravichandran1,2, Anindita Puri1, Suhas H Bhate1

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Researchers engineered more stable proteins by optimizing hydrophobic core packing through targeted amino acid substitutions. This method enhances protein thermal stability for industrial and biomedical applications without compromising function.

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Area of Science:

  • Protein Engineering
  • Biophysics
  • Computational Biology

Background:

  • Protein thermostability is crucial for industrial and biomedical applications, enhancing integrity and function at high temperatures.
  • Current methods for improving protein stability are limited, necessitating novel strategies.

Purpose of the Study:

  • To develop a computational method for enhancing protein thermal stability by optimizing the hydrophobic core.
  • To validate the method's efficacy using experimental and simulation techniques.

Main Methods:

  • Developed an algorithm to identify and substitute buried hydrophobic residues with longer or bulkier side chains.
  • Calculated free energy of unfolding (ΔG) to select stabilizing substitutions, excluding functionally critical regions.
  • Applied the method to beta-grasp proteins, with experimental validation on NEDD8.

Main Results:

  • Two predicted substitutions significantly increased NEDD8's thermal stability (1.7 kcal/mol) and melting point (17°C).
  • Molecular dynamics (MD) simulations and NMR spectroscopy showed reduced fluctuations and enhanced stabilizing interactions.
  • Functional assays confirmed that engineered substitutions preserved NEDD8's fold and biological activity.

Conclusions:

  • Optimizing buried hydrophobic residues is an effective strategy for enhancing protein thermal stability.
  • The developed computational approach provides a general framework for designing robust proteins for various applications.