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Area of Science:

  • Optogenetics
  • Molecular Biology
  • Biochemistry

Background:

  • Optogenetic tools traditionally rely on blue light, limiting applications.
  • Red-light tools offer deeper tissue penetration and reduced phototoxicity.
  • Existing red-light systems often use large, complex proteins like phytochromes.

Purpose of the Study:

  • To develop a small, simple red-light-only optogenetic system.
  • To enable precise control of protein-protein interactions using red light.
  • To overcome limitations of current optogenetic tools.

Main Methods:

  • Development of a novel red-light responsive binder (BNp-Red-1.2) and a cyanobacteriochrome (CBCR) GAF domain (NpF2164g6).
  • Characterization of complex formation and dissociation using binding affinity measurements (Kd).
  • Structural analysis via NMR, molecular docking, and dynamics simulations.

Main Results:

  • A 1:1 complex formed between BNp-Red-1.2 and the CBCR GAF domain in the dark.
  • Red light induced >25-fold decrease in binding affinity, causing complex dissociation.
  • The system demonstrated reversible complex formation with a half-life of ~1 min.
  • Structural studies revealed interaction mechanism sensing chromophore isomerization.

Conclusions:

  • A novel, small, red-light-only optogenetic system was successfully developed.
  • This system enables red-light-controlled protein-protein interactions in vitro and in cells.
  • The findings offer a new tool for multiwavelength optogenetics and biological research.