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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Enzymes02:34

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The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
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Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Entropy and Enzyme Catalysis.

Johan Åqvist1, Masoud Kazemi1, Geir Villy Isaksen1,2

  • 1Department of Cell and Molecular Biology, Uppsala University, Biomedical Center , Box 596, SE-751 24 Uppsala, Sweden.

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Enzymes dramatically speed up reactions using entropy, but its origin remained unclear. New computational methods now reveal the microscopic details of these entropic effects in enzymes and cold-adapted enzymes.

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Structural Biology

Background:

  • Enzymes achieve significant rate enhancements through entropic effects, reducing activation free energy by up to 10 kcal/mol.
  • The precise origin of large entropic contributions to enzyme catalysis remains a long-standing debate.
  • Cold-adapted enzymes exhibit universal enthalpy-entropy compensation, but its structural basis is elusive.

Purpose of the Study:

  • To develop and validate a computational approach for determining thermodynamic activation parameters.
  • To elucidate the microscopic origins of entropic effects in enzyme catalysis.
  • To investigate the structural basis of cold adaptation in enzyme kinetics.

Main Methods:

  • Devised a novel computational method to calculate activation parameters from temperature-dependent free energy profiles.
  • Employed extensive molecular dynamics simulations and thousands of free energy calculations.
  • Applied the method to enzyme-catalyzed reactions (cytidine deaminase, ribosome) and spontaneous solution reactions.

Main Results:

  • The computational approach shows remarkable agreement with experimental thermodynamic data.
  • Successfully rationalized large entropic contributions to catalysis for specific enzyme examples.
  • Demonstrated that cold adaptation's enthalpy-entropy compensation stems from protein surface mechanics.

Conclusions:

  • The new computational method provides unprecedented insight into enzyme catalysis and thermodynamics.
  • Microscopic origins of significant entropic effects in enzymes are now computationally accessible.
  • Protein surface mechanical properties are identified as the source of the universal cold-adaptation phenomenon.