A linker system is provided where a small molecule reactive group, e.g., an activity based probe which binds to certain enzymes at the active site, is linked through an aryl diazo linker to an affinity molecule such as biotin. The reactive group may comprise a number of functionalities known to react with a specific target to be studied. This enables the probe to be exposed to analytes, such as proteins and bind specifically to them to form a complex having an affinity molecule allowing immobilization of the bound analyte on an affinity column or other support, e.g. with streptavidin. Then, the linker is cleaved without causing removal of the affinity group or dissociation of the probe from the analyte. The linker is cleaved under mild reducing conditions, e.g., dithionite. The probe is synthesized along with the linker on a solid support.
提供了一个连接系统,其中一个小分子的反应基团,例如一个能够结合到某些酶的活性基团,通过芳基重氮连接物连接到一种亲和分子,比如
生物素。这个反应基团可能包括一些已知能与特定目标反应的官能团。这使得探针能够暴露给待测物,比如蛋白质,并特异性地与它们结合形成一个具有亲和分子的复合物,从而使结合的待测物能够固定在亲和柱或其他支持物上,例如与链球菌素结合。然后,在不导致亲和基团脱落或探针与待测物解离的情况下,断裂连接物。连接物在温和还原条件下被断裂,例如二
亚硫酸盐。探针与连接物一起在固体支持物上合成。