A fluorescence-quencher pair for DNA hybridization studies based on hydrophobic base surrogates
摘要:
The synthesis of the novel, fluorescent 3-aminobiphenyl-C-nucleoside M as well as the corresponding building block for oligodeoxynucleotide synthesis is described. M was incorporated into oligodeoxynucleotides via standard phosphoramidite chemistry and the thermal stabilities of duplexes with one and three consecutive M-M, M-P, and M-O pairs, where P denotes an unmodified biphenyl C-nucleoside and O a 3,5-dinitrobiphenyl-C-nucleoside, were determined. It was found that duplexes containing three consecutive M-O pairs were the most stable in the series, notably more stable than a duplex with one additional natural G-C pair instead of the modified residues. Furthermore it was found that the fluorescence of M is efficiently quenched in a duplex when placed opposite to the dinitrophenyl unit O. Thus M and O constitute a novel fluorophore/quencher pair that is orthogonal to natural base pairs in its recognition properties enabling its use as highly specific tags with reporting properties. (c) 2007 Elsevier Ltd. All rights reserved.
A fluorescence-quencher pair for DNA hybridization studies based on hydrophobic base surrogates
摘要:
The synthesis of the novel, fluorescent 3-aminobiphenyl-C-nucleoside M as well as the corresponding building block for oligodeoxynucleotide synthesis is described. M was incorporated into oligodeoxynucleotides via standard phosphoramidite chemistry and the thermal stabilities of duplexes with one and three consecutive M-M, M-P, and M-O pairs, where P denotes an unmodified biphenyl C-nucleoside and O a 3,5-dinitrobiphenyl-C-nucleoside, were determined. It was found that duplexes containing three consecutive M-O pairs were the most stable in the series, notably more stable than a duplex with one additional natural G-C pair instead of the modified residues. Furthermore it was found that the fluorescence of M is efficiently quenched in a duplex when placed opposite to the dinitrophenyl unit O. Thus M and O constitute a novel fluorophore/quencher pair that is orthogonal to natural base pairs in its recognition properties enabling its use as highly specific tags with reporting properties. (c) 2007 Elsevier Ltd. All rights reserved.