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Substrate positioning dynamics (SPD) significantly impacts enzyme catalysis through non-electrostatic effects. Optimizing SPD enhances transition state stabilization and catalytic efficiency by favoring reactive conformations.

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Area of Science:

  • Enzyme kinetics and catalysis
  • Biophysical chemistry
  • Computational enzymology

Background:

  • Substrate positioning dynamics (SPD) influences enzyme catalytic efficiency by orienting substrates in the active site.
  • The relative contribution of electrostatic versus non-electrostatic components of SPD to catalysis remains unclear.

Purpose of the Study:

  • To investigate the role of the non-electrostatic component of SPD in transition state (TS) stabilization.
  • To determine if SPD can independently mediate catalysis with a significant non-electrostatic contribution.

Main Methods:

  • Utilized high-throughput enzyme modeling to select Kemp eliminase variants with controlled electrostatics but varied SPD.
  • Experimentally characterized kinetic parameters of selected enzyme variants.
  • Quantified SPD using a substrate positioning index and calculated TS stabilization free energy.

Main Results:

  • Observed a distinct, two-segment linear correlation between TS stabilization free energy and the substrate positioning index.
  • Identified a variation of approximately 2 kcal/mol in energy across different SPD profiles.
  • The R154W mutant exhibited favorable SPD, increasing reactive conformations and achieving the lowest activation free energy.

Conclusions:

  • The non-electrostatic component of substrate positioning dynamics significantly contributes to enzyme catalytic efficiency.
  • SPD plays a crucial role in transition state stabilization beyond electrostatic interactions.
  • Enzyme engineering strategies can leverage SPD to enhance catalytic performance.