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Area of Science:

  • Chemical Biology
  • Organic Chemistry
  • Bioconjugation

Background:

  • Bioorthogonal ligations are crucial tools for studying biological systems.
  • Optimizations have focused on reaction speed and orthogonality.
  • Controlling bioorthogonal reactions in space and time remains a challenge.

Purpose of the Study:

  • To develop a modular strategy for controlling the cyclopropene-tetrazine ligation.
  • To enable temporal and spatial control over bioorthogonal reactivity.

Main Methods:

  • Synthesis of 3-N-substituted spirocyclopropenes with bulky, light-cleavable caging groups.
  • Steric hindrance by protecting groups was used to inhibit tetrazine approach.
  • Light-induced removal of caging groups to restore reactivity.

Main Results:

  • Developed 3-N spirocyclopropenes that are initially unreactive towards tetrazines.
  • Light-cleavable caging groups successfully suppressed cyclopropene reactivity.
  • Demonstrated restoration of cyclopropene-tetrazine ligation upon light-induced deprotection in solution and on proteins.

Conclusions:

  • A novel reactivity caging strategy for the cyclopropene-tetrazine ligation was established.
  • This method allows for modular, light-triggered control of bioorthogonal reactions.
  • The approach is adaptable for various applications requiring spatiotemporal control.