title: The 6-methoxymethyl derivative of pyrrolo-dC for selective fluorometric detection of guanosine-containing sequences.
abstract: The beta-cyanoethyl phosphosphoramidite derivatives of 6-methyl- and 6-methoxymethyl-3-(2-deoxy-beta-D-ribofuranosyl)-3H-pyrrolo[2,3-d]pyrimidin-2-one have been synthesized. These monomers have been employed for oligodeoxynucleotide synthesis to evaluate their effect on duplex stability and ability to fluorometrically report on hybridization. The structurally conservative 6-methoxymethyl-substitution results in a pyrrolocytidine that is stabilizing toward hybrid formation (Delta Tm = +1.3 degrees C) whereas the known 6-methylpyrrolocytidine is destabilizing (Delta Tm = -4.7 degrees C), in the sequence examined. The 6-methoxymethylpyrrolocytidine retains excellent mismatch discrimination and its fluorescence is selectively quenched when hybridized to a match oligodeoxynucleotide sequence. The quenching of fluorescence for an internal position is approximately three-fold, whereas a terminal position (5'-end or 3'-end) experienced approximately two-fold decrease in the fluorescence intensity.
authors: Department of Chemistry, The University of Western Ontario, London, Ontario, Canada. rhhudson@uwo.ca
authors: Robert H E
authors: RH
authors: Hudson
authors: Arash Ghorbani
authors: AG
authors: Choghamarani
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000737:chemistry; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000032:analysis* / Q000737:chemistry; D005470:Fluorometry; D009691:Nucleic Acid Denaturation
chemical_list: D004247:DNA; D003849:Deoxyguanosine