作者:Tadashi Umemoto、Jesper Wengel、Andreas Stahl Madsen
DOI:10.1039/b901028a
日期:——
Thymin-1-yl-acetic acid and adenin-9-yl-acetic acid have been coupled to the N2â²-atom of a 2â²-amino-LNA thymine nucleoside, and these âdouble-headedâ LNA monomers have been incorporated into oligodeoxyribonucleotides via their corresponding phosphoramidite derivatives. Oligonucleotides containing these modified nucleotides show in most cases increased thermal stability when forming duplexes with complementary DNA, even allowing multiple incorporations. Incorporation of âdouble-headedâ LNA monomers in both strands also led to stable duplexes, however, no indication of WatsonâCrick base pairing between the extra nucleobases could be found.
胸腺嘧啶-1-基乙酸和腺嘌呤-9-基乙酸已与2'-氨基-LNA胸腺核苷的N2'-原子结合,这些“双头”LNA单体已通过其相应的磷酰胺衍生物被纳入寡脱氧核糖核酸中。含有这些修饰核苷的寡核苷酸在与互补DNA形成双链时,通常显示出更高的热稳定性,甚至允许多次纳入。在两条链中都纳入“双头”LNA单体也导致了稳定的双链形成,但未能发现额外核苷碱基之间的沃森–克里克配对的迹象。