Biopolym. Cell. 2025; 41(2):121.
Bioorganic Chemistry
Effect of DNA, RNA and HSA on the spectral-luminescent properties of several monomethine cyanine dyes
1Kazakov–Kravchenko O. S., 1Balanda A. O., 2Losytskyy M. Yu., 1Yarmoluk S. M.
  1. Institute of Molecular Biology and Genetics, NAS of Ukraine
    150, Akademika Zabolotnoho Str., Kyiv, Ukraine, 03143
  2. Taras Shevchenko National University of Kyiv
    64, Volodymyrska Str., Kyiv, Ukraine, 01601

Abstract

Aim. This work was aimed at investigation of the effect of DNA, RNA, and HSA on the absorption and fluorescence spectra of 8 monomethine cyanine dyes, which are based on different chromophores and contain various affinity-modifying groups. Methods. UV-vis absorption and fluorescence spectroscopy. Results. Several dyes were found to have good fluorescent responses to the presence of DNA, RNA, and HSA. The dye fb128, which contains a charged group, was shown to increase its fluorescence intensity in the presence of DNA and RNA by 160 and 240 times, respectively, while the dye up385 increased its fluorescence intensity by almost 60 times in the presence of human serum albumin. Conclusions. The most promising dye fb128, as well as the dyes fb123, fb124 and fb131, can be further investigated as fluorescent probes sensitive to nucleic acids in various specific applications (PCR, fluorescent microscopy etc.).
Keywords: monomethine cyanine dyes, fluorescent probes, nucleic acids, human serum albumin

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