title: A pteridine derivative with electron-withdrawing groups for binding and sensing of nucleobases in AP site-containing DNA duplexes.
abstract: A pteridine derivative having electron-withdrawing CF(3) groups, 2-amino-6,7-bis(trifluoromethyl)-4-hydoroxypteridine (2CF(3)-pteridine), is presented as a candidate for multi-functional fluorescent ligand for single-nucleotide polymorphisms (SNPs) typing. In solutions buffered to pH 8.0 (I = 0.1 M, at 5 degrees C), 2CF(3)- pteridine can bind to guanine, cytosine and thymine opposite an abasic site in DNA duplexes (5'-TCTGC GTCCA GXG CAACGCACAC-3'/3'-AGACG CAGGT CNC GTTGCGTGTG-5', X = abasic site; Spacer-C3, N = G, C, A, T). For these three nucleobases, the binding of 2CF(3)-pteridine is explained by 1:1 complexation, and the binding affinities are comparable (K(11) / 10(5) M(-1): G: 3.0; C: 1.6; T: 3.3). Binding-induced fluorescence responses are effectively different between guanine and pyrimidines (C, T): the binding to pyrimidines is accompanied by a significant change in the shape of fluorescence spectra. These binding and sensing properties allow a detection of G/T or G/C mutation based on a single fluorescence ligand.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, and CREST, Japan Science and Technology Agency (JST), Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Eriko
authors.initials: E
authors.lastname: Kanai
authors.forename: Seiichi
authors.initials: S
authors.lastname: Nishizawa
authors.forename: Norio
authors.initials: N
authors.lastname: Teramae
mesh_terms: D003596:Cytosine / Q000737:chemistry; D004247:DNA / Q000737:chemistry*; D004583:Electrons; D006147:Guanine / Q000737:chemistry; D020641:Polymorphism, Single Nucleotide; D011621:Pteridines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013941:Thymine / Q000737:chemistry
chemical_list: C541615:2-amino-6,7-bis(trifluoromethyl)-4-hydroxypteridine; D011621:Pteridines; D006147:Guanine; D003596:Cytosine; D004247:DNA; D013941:Thymine