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Enhanced Diffusion of Single, Lipid-Tethered Enzymes.

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Enzymes catalyzing reactions exhibit enhanced diffusion, moving faster when active. This propulsion effect, observed in urease, could enable nanoscale active materials and engineered active particles.

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Area of Science:

  • Biophysics
  • Nanotechnology
  • Enzymology

Background:

  • Enzymes catalyzing exergonic reactions may exhibit enhanced diffusion during catalysis.
  • This phenomenon, if validated, could lead to engineered nanoscale active materials.
  • Further experimental validation under controlled conditions is necessary.

Purpose of the Study:

  • To experimentally validate and quantify enzyme-catalyzed enhanced diffusion.
  • To investigate the influence of substrate concentration and enzyme complex formation on diffusion.
  • To explore the potential of enzymes as building blocks for active nanoscale materials.

Main Methods:

  • Single-molecule tracking of urease enzymes tethered to fluid lipid bilayers.
  • Constraining enzyme motion to two dimensions for improved sensitivity.
  • Varying substrate (urea) concentration and enzyme complex assembly.

Main Results:

  • Active urease demonstrated approximately 40% faster diffusion in the presence of substrate compared to absence or inhibition.
  • Diffusion enhancement scaled with substrate concentration.
  • Assembling multiple enzymes into larger complexes resulted in greater diffusion enhancement.

Conclusions:

  • Enzyme-catalyzed enhanced diffusion is experimentally validated in a controlled system.
  • Enzymes can be utilized as a platform for creating and studying active particles at the nanoscale.
  • This work supports the potential for enzyme propulsion in engineered active materials.