Electronic Modifications of Fluorescent Cytidine Analogues Control Photophysics and Fluorescent Responses to Base Stacking and Pairing
作者:Kristine L. Teppang、Raymond W. Lee、Dillon D. Burns、M. Benjamin Turner、Melissa E. Lokensgard、Andrew L. Cooksy、Byron W. Purse
DOI:10.1002/chem.201803653
日期:2019.1.24
neighbor nucleobases. Moreover, matched basepairing enhances fluorescence turn-on for the electron-rich compounds, and it causes a fluorescence decrease for the electron-deficient compounds. For the tCO compounds, the emergence of vibrational fine structure in the fluorescence spectra in response to basepairing and stacking was observed, offering a potential new tool for studying nucleicacid structure
COMPOUNDS FOR FLUORESCENCE SENSING OF DUPLEX FORMATION
申请人:San Diego State University Research Foundation
公开号:US20200262862A1
公开(公告)日:2020-08-20
Herein reported are new tricyclic cytidine compounds, such as 8-diethylamino-tC (8-DEA-tC), that respond to DNA and/or RNA duplex formation with up to a 20-fold increase in fluorescent quantum yield as compared with the free nucleoside, depending on neighboring bases. This turn-on response to duplex formation is by far the greatest of any reported nucleoside analogue that can participate in Watson-Crick base pairing. Measurements of the quantum yield of 8-DEA-tC mispaired with adenosine and, separately, opposite an abasic site show that there is almost no fluorescence increase without the formation of correct Watson-Crick hydrogen bonds. Kinetic isotope effects from the use of deuterated buffer show that the duplex protects 8-DEA-tC against quenching by excited state proton transfer. DFT calculations provide a rationale for the observed photophysical properties that is dependent on duplex integrity and the electronic structure of the analogue.
[EN] COMPOUNDS FOR FLUORESCENCE SENSING OF DUPLEX FORMATION<br/>[FR] COMPOSÉS POUR LA DÉTECTION PAR FLUORESCENCE D'UNE FORMATION DE DUPLEX
申请人:SAN DIEGO STATE UNIV RESEARCH FOUNDATION
公开号:WO2018089582A1
公开(公告)日:2018-05-17
Herein reported are new tricyclic cytidine compounds, such as 8-diethylamino-tC (8-DEA-tC), that respond to DNA and/or RNA duplex formation with up to a 20-fold increase in fluorescent quantum yield as compared with the free nucleoside, depending on neighboring bases. This turn-on response to duplex formation is by far the greatest of any reported nucleoside analogue that can participate in Watson-Crick base pairing. Measurements of the quantum yield of 8-DEA-tC mispaired with adenosine and, separately, opposite an abasic site show that there is almost no fluorescence increase without the formation of correct Watson-Crick hydrogen bonds. Kinetic isotope effects from the use of deuterated buffer show that the duplex protects 8-DEA-tC against quenching by excited state proton transfer. DFT calculations provide a rationale for the observed photophysical properties that is dependent on duplex integrity and the electronic structure of the analogue.
Fluorescence Turn-On Sensing of DNA Duplex Formation by a Tricyclic Cytidine Analogue
作者:Dillon D. Burns、Kristine L. Teppang、Raymond W. Lee、Melissa E. Lokensgard、Byron W. Purse
DOI:10.1021/jacs.6b10410
日期:2017.2.1
Most fluorescentnucleosideanalogues are quenched when base stacked and some maintain their brightness, but there has been little progress toward developing nucleosideanalogues that markedly increase their fluorescence upon duplex formation. Here, we report on the design and synthesis of a new tricyclic cytidine analogue, 8-diethylamino-tC (8-DEA-tC), that responds to DNA duplex formation with up