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Protein rigidity and thermophilic adaptation.

Sebastian Radestock1, Holger Gohlke

  • 1Mathematisch-Naturwissenschaftliche Fakultät, Institut für Pharmazeutische und Medizinische Chemie, Heinrich-Heine-Universität Düsseldorf, Germany.

Proteins
|January 20, 2011
PubMed
Summary

Homologous proteins from different organisms maintain similar flexibility and rigidity at their optimal temperatures, supporting the hypothesis of corresponding states. This principle aids in optimizing enzyme stability and activity for protein engineering.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Engineering

Background:

  • The hypothesis of corresponding states suggests homologous proteins from organisms with different temperature optima exhibit similar structural dynamics at their respective temperatures.
  • Understanding protein adaptation to extreme temperatures is crucial for biotechnology and enzyme engineering.

Purpose of the Study:

  • To investigate the hypothesis of corresponding states in homologous proteins from mesophilic and thermophilic organisms.
  • To analyze the relationship between protein structure, flexibility, and enzyme activity at different temperatures.

Main Methods:

  • Constraint Network Analysis (CNA) to study local flexibility and rigidity in 19 protein pairs.
  • Introduction and application of stability maps to compare microscopic stability features.
  • Analysis of 3-isopropylmalate dehydrogenase and thermolysin-like protease as model systems.

Main Results:

  • Thermophilic adaptation increases protein rigidity but preserves the distribution of flexible regions essential for activity.
  • Adaptive mutations balance overall rigidity for thermostability with local flexibility for function.
  • Stability maps reveal conserved patterns of flexibility and rigidity in homologous proteins.

Conclusions:

  • The study provides direct evidence supporting the hypothesis of corresponding states in proteins.
  • Constraint Network Analysis effectively integrates various mechanisms of thermostability and high-temperature activity.
  • The principle of corresponding states offers a framework for optimizing enzyme thermostability and activity in protein engineering.