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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Nanotechnology

Background:

  • Catalytic enzymes with enhanced motion are of significant interest.
  • However, the environmental impact of enzyme activity remains poorly understood.

Purpose of the Study:

  • To investigate the environmental effects of active enzymes using a model urease system.
  • To simultaneously monitor the diffusion of single anisotropic gold nanorods (AuNRs) to probe these effects.

Main Methods:

  • Utilized high-speed dark-field imaging to track the diffusion of individual AuNRs.
  • Applied the Stokes-Einstein equation to analyze diffusion coefficients and infer environmental changes.
  • Varied substrate concentration to observe effects on AuNR diffusion heterogeneity.

Main Results:

  • Observed enhanced translational and rotational diffusion of AuNRs, with inconsistent degrees.
  • Found increased spatial but decreased temporal heterogeneity in AuNR diffusion with rising substrate concentration.
  • Detected intermittent ballistic motion in AuNRs, suggesting localized environmental disturbances.

Conclusions:

  • The catalytic reaction of urease induces localized, inhomogeneous distributions of enzymes in solution.
  • These enzymatic reactions subtly affect the local physicochemical environment, influencing particle dynamics.
  • High-speed imaging of nanorods provides a sensitive method for studying enzyme-induced environmental heterogeneity.