Positively charged GFP-chromophore-based fluorescent sensor for DNA

Ming Ju Li, Jun Jia Xu, Robert Sung, Kuangsen Sung

Research output: Contribution to journalArticlepeer-review


Fluorescence titration of the positively charged green fluorescent protein (GFP) chromophore analogue 1 with E. Coli plasmid DNA [pcDNA3.1(−)] confirms that 1 serves as a fluorescent probe for sensing E. Coli plasmid DNA. The binding constant K between the DNA and 1 is as large as 2.9 × 105. The sensing mechanism is that the intermolecular steric hindrance generated between 1 and E. Coli plasmid DNA by electrostatic attraction restricts the φ-torsion around P-bond and τ-torsion around I-bond of 1, enhancing fluorescence of 1.

Original languageEnglish
Article number115581
JournalOptical Materials
Publication statusPublished - 2024 Jul

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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