Fine tuning of pyrene excimer fluorescence in molecular beacons by alteration of the monomer structure

Ilya O. Aparin, Gleb V. Proskurin, Andrey V. Golovin, Alexey V. Ustinov, Andrey A. Formanovsky, Timofei S. Zatsepin, Vladimir A. Korshun

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)

    Abstract

    Oligonucleotide probes labeled with pyrene pairs that form excimers have a number of applications in hybridization analysis of nucleic acids. A long excited state lifetime, large Stokes shift, and chemical stability make pyrene excimer an attractive fluorescent label. Here we report synthesis of chiral phosphoramidite building blocks based on (R)-4-amino-2,2- dimethylbutane-1,3-diol, easily available from an inexpensive D-(-)-pantolactone. 1-Pyreneacetamide, 1-pyrenecarboxamide, and DABCYL derivatives have been used in preparation of molecular beacon (MB) probes labeled with one or two pyrenes/ quenchers. We observed significant difference in the excimer emission maxima (475-510 nm; Stokes shifts 125-160 nm or 7520-8960 cm-1) and excimer/monomer ratio (from 0.5 to 5.9) in fluorescence spectra depending on the structure and position of monomers in the pyrene pair. The pyrene excimer formed by two rigid 1-pyrenecarboxamide residues showed the brightest emission. This is consistent with molecular dynamics data on excimer stability. Increase of the excimer fluorescence for MBs after hybridization with DNA was up to 24-fold.

    Original languageEnglish
    Pages (from-to)10015-10024
    Number of pages10
    JournalJournal of Organic Chemistry
    Volume82
    Issue number19
    DOIs
    Publication statusPublished - 2017

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