申请人:The Research Foundation of State University of New York
公开号:US05292873A1
公开(公告)日:1994-03-08
A sequence directed reagent is constructed by conjugating a methyl naphthoquinone derivative to a hexamethylamino linker attached to the 5' terminus of an oligonucleotide. Annealing this modified fragment of DNA to its complementary sequence allows for target modification subsequent to photochemical activation. The product of this reaction is a covalent crosslink between the reagent and target strands resulting from an alkylation of DNA by the photoexcited quinone. The modified sequence is not labile to acid, base or reductants, and blocks the exonuclease activity of the Klenow fragment of DNA polymerase I. In another embodiment, a highly reactive moiety, such as Br is attached to the methyl group of the naphthoquinone derivative. This reagent is similarly linked to an oligonucleotide probe. Activation of this probe linked alkylating agent is by a reductive signal which may either naturally occur within the cell, such as an enzyme, or introduced into the media containing the target molecule.
一种序列定向试剂被构建,通过将甲基萘醌衍生物与连接到寡核苷酸5'端的六甲基氨基连接剂共轭。将这个修改后的DNA片段与其互补序列退火,可在光化学激活后进行目标修饰。此反应的产物是试剂和目标链之间的共价交联,由光激发的醌对DNA的烷基化反应导致。修改的序列不易受到酸、碱或还原剂的影响,并阻止DNA聚合酶I的Klenow片段的外切酶活性。在另一种实施方式中,高反应性的基团,如Br,附加到萘醌衍生物的甲基基团上。这种试剂类似地连接到寡核苷酸探针上。激活这个探针连接的烷基化试剂是通过还原信号,可以自然地发生在细胞内,如酶,或引入到含有目标分子的介质中。