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Structural features determining thermal adaptation of esterases.

Filip Kovacic1, Agathe Mandrysch1, Chetan Poojari2

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Protein Engineering, Design & Selection : PEDS
|December 10, 2015
PubMed
Summary

Extremophilic enzymes adapt to varied temperatures by optimizing surface loop flexibility, maintaining function across diverse thermal environments. This adaptation allows bacteria to tune protein interactions for specific temperature needs.

Keywords:
esterasemolecular dynamicspsychrophilic, psychrotrophic, mesophilic, thermophilic bacteriathermophilicitythermostability

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Extremophilic enzymes are crucial for understanding protein stability, dynamics, and function at extreme temperatures.
  • The molecular mechanisms by which enzymes adapt to varying temperatures remain incompletely understood.

Purpose of the Study:

  • To investigate how enzymes from bacteria adapted to different temperatures modulate their thermal properties.
  • To explore the relationship between protein surface flexibility and enzyme function across a range of temperatures.

Main Methods:

  • Analysis of four homologous esterases from bacteria with habitats ranging from 10°C to 70°C.
  • Biochemical characterization of recombinant esterases.
  • Molecular dynamics simulations at temperatures near optimal catalytic temperatures.

Main Results:

  • Esterase biochemical properties were conserved, but thermal properties adapted to their native habitats.
  • Molecular dynamics revealed temperature-dependent flexibility in four surface-exposed loops.
  • Some loops showed increased flexibility with higher temperatures (stability-related), while others showed flexibility changes with both increasing and decreasing temperatures (function-related).
  • Structural variations in these surface loops were more pronounced than in the overall protein structure.

Conclusions:

  • Enzyme adaptation to extreme temperatures involves optimizing local flexibility in surface-exposed loops.
  • Preserved flexibility in specific loops is vital for maintaining proper enzyme function across different temperatures.
  • Frequent amino acid substitutions in these loops allow bacteria to fine-tune enzyme properties for specific thermal requirements without compromising overall function.