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Light-Responsive DNA Droplets for Controlling Enzyme Cascade Pathways by Dynamic Phase Separation.

Shaohong Zhou1, Xiuqin Ju1, Hui Chen1

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Researchers developed light-responsive DNA droplets to precisely control enzyme cascades. These dynamic compartments regulate metabolic flux using visible and ultraviolet light, offering new possibilities for synthetic biology.

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Materials Science

Background:

  • Precise control of enzymatic cascade pathways is crucial for understanding metabolism and engineering synthetic biological systems.
  • Dynamic regulation of enzyme activity is a key challenge in biochemical engineering and synthetic biology.

Purpose of the Study:

  • To present a novel method for modulating enzymatic cascades using light-responsive DNA droplets.
  • To demonstrate the dynamic control of enzyme sequestration and release in response to light stimuli.

Main Methods:

  • Design of Y-motif DNA sequences with azobenzene-modified sticky ends for light-responsive liquid-liquid phase separation.
  • Formation of DNA droplets to compartmentalize and regulate enzymatic cascades.
  • Utilizing ultraviolet (UV) and visible (vis) light to trigger droplet assembly and disassembly, controlling enzyme activity.

Main Results:

  • Demonstrated dynamic regulation of enzymatic cascades (glucose oxidase, horseradish peroxidase, catalase) using light-responsive DNA droplets.
  • Showcased reversible control over metabolic flux by light-induced enzyme co-localization and release.
  • Validated the approach with a second enzymatic system (galactose oxidase, myeloperoxidase, catalase), confirming versatility.

Conclusions:

  • Light-responsive DNA droplets provide a powerful and versatile tool for precise spatiotemporal control of enzymatic pathways.
  • This approach has significant potential applications in synthetic biology, microreactor design, and bioengineering.
  • The ability to dynamically regulate enzyme activity opens new avenues for designing complex biochemical systems.