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Computer simulations explain the anomalous temperature optimum in a cold-adapted enzyme.

Jaka Sočan1, Miha Purg1, Johan Åqvist2

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Cold-adapted enzymes exhibit unique thermal properties. Computer simulations reveal that a specific enzyme-substrate interaction breaking causes thermal inactivation in psychrophilic α-amylases before protein unfolding.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Cold-adapted enzymes from psychrophilic organisms display increased heat lability and altered thermodynamic contributions to catalysis compared to their mesophilic counterparts.
  • Some cold-adapted enzymes exhibit unusual inactivation at elevated temperatures prior to protein unfolding.

Purpose of the Study:

  • To investigate the phenomena of heat lability and anomalous thermal inactivation in cold-adapted enzymes.
  • To analyze the catalytic reactions of psychrophilic and mesophilic α-amylases using extensive computer simulations.

Main Methods:

  • Extensive computer simulations of catalytic reactions.
  • Analysis of temperature-dependent reaction rates.
  • Examination of the structural basis for thermal inactivation.

Main Results:

  • Simulations accurately predicted temperature-dependent reaction rates, aligning with experimental data.
  • An anomalous rate optimum was observed for the cold-adapted enzyme, approximately 15°C below its melting point.
  • Thermal inactivation was structurally attributed to the disruption of a specific enzyme-substrate interaction.

Conclusions:

  • The study elucidates the mechanism of thermal inactivation in cold-adapted α-amylases, linked to a specific enzyme-substrate interaction.
  • This mechanism may be relevant for other enzymes exhibiting anomalous temperature optima.
  • Computational approaches provide valuable insights into enzyme behavior across different temperature ranges.