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Area of Science:

  • Chemical Biology
  • Materials Science
  • Biophysics

Background:

  • Planarizable push-pull fluorescent probes (flipper probes) are mechanophores for sensing forces in lipid bilayers.
  • Optimal flipper probes exhibit excitation red shifts (50-90 nm) and increased fluorescence lifetime in response to membrane order changes.
  • Negligible background fluorescence enables live-cell imaging.

Purpose of the Study:

  • To investigate the impact of substituent modification on flipper probe performance.
  • To understand how steric hindrance affects probe photophysics and membrane interaction.

Main Methods:

  • Synthesis of dithienothiophene dimer-based flipper probes with methyl and isobutyl substituents.
  • Spectroscopic analysis (fluorescence intensity, solvatochromism, fluorescence lifetime).
  • Evaluation of probe response to changes in lipid membrane order (liquid disordered vs. solid ordered).

Main Results:

  • Isobutyl substituents significantly reduced fluorescence intensity compared to methyl groups.
  • Solvatochromism was only slightly increased by isobutyl substituents.
  • The modified probes formed fluorescent micelles in water and failed to respond to membrane order changes, indicating hindered planarization and twisted intramolecular charge transfer (TICT).

Conclusions:

  • Steric bulk of isobutyl groups in "leucine flippers" hinders excited-state planarization, leading to TICT.
  • This structural modification dramatically alters probe function, preventing mechanotransduction.
  • Flipper probe sensitivity to minor structural changes underscores the importance of precise molecular design for specific applications.