Near-Infrared Perylenecarboximide Fluorophores for Live-Cell Super-Resolution Imaging

J Am Chem Soc. 2024 Mar 20;146(11):7135-7139. doi: 10.1021/jacs.3c13368. Epub 2024 Mar 5.

Abstract

Organic near-infrared (NIR) photoblinking fluorophores are highly desirable for live-cell super-resolution imaging based on single-molecule localization microscopy (SMLM). Herein we introduce a novel small chromophore, PMIP, through the fusion of perylenecarboximide with 2,2-dimetheylpyrimidine. PMIP exhibits an emission maximum at 732 nm with a high fluorescence quantum yield of 60% in the wavelength range of 700-1000 nm and excellent photoblinking without any additives. With resorcinol-functionalized PMIP (PMIP-OH), NIR SMLM imaging of lysosomes is demonstrated for the first time in living mammalian cells under physiological conditions. Moreover, metabolically labeled nascent DNA is site-specifically detected using azido-functionalized PMIP (PMIP-N3) via click chemistry, thereby enabling the super-resolution imaging of nascent DNA in phosphate-buffered saline with a 9-fold improvement in spatial resolution. These results indicate the potential of PMIP-based NIR blinking fluorophores for biological applications of SMLM.

MeSH terms

  • Animals
  • DNA
  • Fluorescent Dyes* / chemistry
  • Mammals
  • Microscopy, Fluorescence
  • Optical Imaging
  • Single Molecule Imaging* / methods

Substances

  • Fluorescent Dyes
  • DNA