Provided are biosensors, compositions comprising biosensors, and methods of using biosensors in living cells and organisms. The biosensors are able to be selectively targeted to certain regions or structures within a cell. The biosensors may provide a signal when the biosensor is targeted and/or in response to a property of the cell or organism such as membrane potential, ion concentration or enzyme activity.
Six asymmetric monomethine cyanine dyes have been synthesized and their spectral characteristics and interaction with double stranded (ds)DNA have been investigated for their prospective use as fluorescent markers in molecular biology. Therefore, the non-covalent binding of the compounds with dsDNA was explored. Apart from the fluorescence spectroscopy, the study includes UV/Vis spectrophotometry and circular dichroism spectroscopy, as well as the thermal melting experiments. Although the compounds show relatively low binding affinity toward dsDNA and do not have intrinsic fluorescence, in the presence of dsDNA they exhibited considerable enhancement in fluorescence intensity. Therefore the studied dyes show interesting platform for future modifications directed toward more sequence selective derivatives. The compound with the highest affinity toward dsDNA showed interesting anti-proliferative potential and specificity. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis and fluorescence characteristics of novel asymmetric cyanine dyes for DNA detection
作者:Stefka Kaloyanova、Valeriya M. Trusova、Galyna P. Gorbenko、Todor Deligeorgiev
DOI:10.1016/j.jphotochem.2010.10.002
日期:2011.1
Sixteen new asymmetric monomethine cyanine dyes have been synthesized and their spectral characteristics and interaction with double stranded DNA have been investigated. The dyes absorb in the region 453-519 nm and have molar absorptivities in the range 37.900-93.100IM(-1) cm(-1). The dyes do not have intrinsic fluorescence, but in the presence of dsDNA they exhibited a significant enhancement in fluorescence. The most pronounced increase was found for D9, D10, D12 and D16 allowing the recommendation of these dyes as the most sensitive DNA markers. Thermodynamic analysis of cyanine-DNA complexation was carried out using the McGhee & von Hippel non-cooperative excluded site model, and binding parameters have been derived. A hypothesis describing the DNA-dye binding mode has been proposed. (C) 2010 Elsevier B.V. All rights reserved.