A method for preparing a substrate capable of undergoing catalytic-induced hydrolysis of the phosphate ester at the 3'-position to yield a species capable of being monitored spectrophotometrically or fluorometrically, comprises
(a) blocking a mononucleoside of the formula:
wherein B is a nucleotide base, and wherein the CH20H group at the 4'-position is either cis or trans to said base, with a silyl blocking member at both the 2'-and 5'-hydroxyls of said mononucleoside to form a 2'-, 5'-diblocked mononucleoside; and
(b) forming a 2'-, 5'-diblocked mononucleotide 3'-phosphodiester by bonding said 2'-, 5'-diblocked mononucleoside with a moiety selected from the group consisting of a chromophore or fluorophore;
said silyl blocking member at the 2'-hydroxyl being capable of at least essentially blocking medium-induced hydrolysis of the phosphodiester at the 3'-position, and said silyl blocking member at least at the 2'-hydroxyl being capable of being removed to provide a substrate characterized by the ability to undergo catalytic-induced hydrolysis of the phosphate ester at the 3'-position to yield a species capable of being monitored spectrophotometrically or fluorometrically. The silyl blocking member at least at the 2'-hydroxyl is removed so as to provide a substrate characterized by the ability to undergo catalytic induced hydrolysis of said phosphodiester to yield a species capable of being monitored spectrophotometrically or fluorometrically.
一种制备底物的方法,该底物能够在 3'-位上经历
磷酸酯的催化诱导
水解,从而产生一种能够用分光光度计或荧光计监测的物质,该方法包括
(a) 封闭式中的单核苷:
其中 B 是核苷酸碱基,4'-位上的 CH20H 基团与所述碱基为顺式或反式,在所述单核苷酸的 2'-和 5'-羟基上用
硅烷基封端构件封端,以形成 2'-、5'-双封端单核苷酸;以及
(b) 通过将所述 2',5'-二嵌单核苷酸与选自由发色团或荧光团组成的组的分子键合,形成 2',5'-二嵌单核苷酸 3'-
磷酸二酯;
所述 2'-羟基处的
硅烷基封端构件能够至少基本上阻断介质诱导的 3'-位
磷酸二酯的
水解,并且所述
硅烷基封端构件至少在 2'-羟基处能够被去除,以提供一种底物,其特征是能够经历催化诱导的 3'-位
磷酸酯的
水解,以产生一种能够用分光光度法或荧光计监测的物质。至少在 2'-羟基处的
硅烷基封端构件被移除,以提供一种底物,其特征是能够在催化诱导下
水解所述
磷酸二酯,产生一种能够用分光光度法或荧光光度法监测的物质。