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Modulating Polymerase Activity Through Light-Oxygen-Voltage Domain Insertion.

Daniel Hafki1, Jonas Alda1, Daniel Pietrus1

  • 1Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Str. 4a, Dortmund, 44227, Germany.

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Summary
This summary is machine-generated.

Scientists engineered light-sensitive enzymes using a light-oxygen-voltage (LOV) domain fused to a polymerase. Blue light partially inhibited enzyme activity by blocking substrate or product channels, offering insights for future enzyme control.

Keywords:
AsLOV2Michaelis-Menten kineticsOptogeneticsPhotochemistryRNA polymerase

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Cells adapt to environmental changes via sensing mechanisms.
  • Light-sensing capabilities in cells are often mediated by biomolecular structures.
  • Light-oxygen-voltage (LOV) domains are known photoreceptors used in biological systems.

Purpose of the Study:

  • To investigate the kinetic activity of engineered light-oxygen-voltage (LOV) domain-polymerase fusion variants.
  • To gain mechanistic insights into how LOV domain insertion affects polymerase function in a light-dependent manner.
  • To explore strategies for enhancing light-induced enzyme switchability.

Main Methods:

  • Kinetic analysis of previously selected LOV-polymerase variants.
  • Generation of new LOV-polymerase fusion variants based on specific insertion criteria.
  • Irradiation with blue light (470 nm) to assess photoresponse.

Main Results:

  • All tested active and photoresponsive LOV-polymerase variants showed partial inhibition upon blue light exposure.
  • Inhibition is attributed to light-induced obstruction of polymerase substrate entry or product exit channels.
  • Observed photoinhibition effects were moderate, indicating potential for further optimization.

Conclusions:

  • LOV domain insertion provides a mechanism for light-responsive regulation of polymerase activity.
  • Blue light can reversibly inhibit polymerase function by interfering with substrate/product flow.
  • Further engineering may enhance the degree of light-induced inhibition and enable novel "turn-on" regulatory modes.