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How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
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Forces stabilizing proteins.

C Nick Pace1, J Martin Scholtz1, Gerald R Grimsley2

  • 1Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, United States; Department of Molecular and Cellular Medicine, Texas A&M University Health Science Center, College Station, TX 77843, United States.

FEBS Letters
|May 22, 2014
PubMed
Summary

Protein stability is significantly influenced by hydrophobic interactions and hydrogen bonds. Burying non-polar groups and forming hydrogen bonds both contribute substantially to stabilizing protein structures.

Keywords:
Conformational entropyHydrogen bondsHydrophobic interactionsProtein stability

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Folding

Background:

  • Understanding protein stability is crucial for numerous biological processes.
  • Site-directed mutagenesis has revolutionized the study of protein structure-stability relationships since the late 1980s.

Purpose of the Study:

  • To summarize key findings on the major forces stabilizing proteins.
  • To review experimental evidence regarding hydrophobic and hydrogen bonding contributions to protein stability.

Main Methods:

  • Analysis of experimental data from site-directed mutagenesis studies.
  • Examination of hydrophobic interaction variants across 11 proteins.
  • Investigation of hydrogen bonding variants in 15 proteins.

Main Results:

  • Burying a -CH2- group contributes approximately 1.1±0.5 kcal/mol to protein stability.
  • Hydrophobic interactions stabilize proteins through water exclusion and enhanced London dispersion forces from tight packing.
  • Forming hydrogen bonds contributes about 1.1±0.8 kcal/mol, with context-dependent effects.
  • Polar group burial can be favorable even without hydrogen bonding.

Conclusions:

  • Both hydrophobic interactions and hydrogen bonds are major contributors to protein stability.
  • The contribution of hydrogen bonds is highly context-dependent.
  • Tight packing and van der Waals forces, alongside water exclusion, are key to hydrophobic stabilization.