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Related Experiment Videos

Increasing protein stability by altering long-range coulombic interactions.

G R Grimsley1, K L Shaw, L R Fee

  • 1Department of Medical Biochemistry and Genetics, Texas A&M University, College Station 77843-1114, USA.

Protein Science : a Publication of the Protein Society
|September 24, 1999
PubMed
Summary
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Reversing a protein surface side chain

Area of Science:

  • Protein engineering
  • Biochemistry
  • Structural biology

Background:

  • Increasing protein stability is challenging using traditional methods like hydrogen bonds or burying hydrophobic surfaces.
  • Surface-exposed amino acid residues play a crucial role in protein structure and function.
  • Electrostatic interactions are key factors influencing protein stability.

Purpose of the Study:

  • To investigate the effect of reversing surface side chain charge on protein stability.
  • To explore novel strategies for enhancing protein stability through electrostatic engineering.
  • To understand the contribution of coulombic interactions to the overall stability of proteins.

Main Methods:

  • Site-directed mutagenesis was used to alter specific amino acid residues on the protein surface.

Related Experiment Videos

  • Protein stability was measured using techniques like differential scanning calorimetry (DSC) or circular dichroism (CD) spectroscopy.
  • The impact of charge reversal on protein stability was assessed at various pH values.

    • Main Results:

    • Reversing the charge of surface-exposed aspartate residues (Asp49 in Ribonuclease T1, Asp25 and Glu74 in ribonuclease Sa) to a positive charge (histidine or lysine) significantly increased protein stability.
    • Asp49Ala mutation in Ribonuclease T1 showed increased stability at neutral pH but decreased stability at acidic pH.
    • Substituting hydrophobic aromatic residues for Ala49 in Ribonuclease T1 resulted in decreased stability, indicating a reverse hydrophobic effect.

    Conclusions:

    • Reversing the charge of surface side chains is an effective strategy for enhancing protein stability.
    • Optimizing coulombic interactions on the protein surface can lead to significant improvements in protein stability.
    • The study highlights the importance of electrostatic interactions and challenges the conventional hydrophobic effect in protein stabilization.