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Ising Model Reprogramming of a Repeat Protein's Equilibrium Unfolding Pathway.

C Millership1, J J Phillips1, E R G Main1

  • 1School of Biological and Chemical Sciences, G.E. Fogg Building, Queen Mary, University of London, Mile End Road, London, E1 4NS, UK.

Journal of Molecular Biology
|March 8, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a new Ising model to analyze repeat proteins, enabling the design of proteins that unfold in a controlled manner, creating stable intermediates for potential functional regulation.

Keywords:
linear Ising modelprotein designprotein foldingrepeat protein

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Area of Science:

  • Protein folding and stability analysis
  • Computational biophysics
  • Structural biology

Background:

  • Repeat proteins feature modular, repetitive structures.
  • Traditional homozipper Ising models analyze identical subunits but cannot account for varying stabilities.
  • Understanding thermodynamic stability is crucial for protein engineering.

Purpose of the Study:

  • To develop and apply a heteropolymer Ising model for analyzing repeat proteins with subunits of differing stabilities.
  • To guide the reprogramming of unfolding pathways in consensus tetratricopeptide repeat proteins (CTPRs).
  • To engineer CTPR variants with specific unfolding behaviors and stable intermediates.

Main Methods:

  • Construction and fitting of a heteropolymer Ising model to CTPR helix deletion series.
  • Analysis of thermodynamic stability and asymmetry within CTPR ensembles.
  • Introduction of destabilizing mutations to alter unfolding pathways.

Main Results:

  • The heteropolymer Ising model successfully described CTPR ensembles, revealing asymmetric stability distributions.
  • Reprogramming CTPR unfolding pathways by increasing thermodynamic asymmetry.
  • Creation of a specific, stable intermediate through preferential unfolding of the terminal α-helix.

Conclusions:

  • The heteropolymer Ising model provides a more sophisticated approach to analyzing repeat protein stability.
  • Engineered thermodynamic asymmetry can precisely control protein unfolding pathways.
  • This work represents a significant step towards designing repeat proteins with function regulated by conformational switches.