The present disclosure encompasses oligonucleotide aptamers selectively binding a target glycosylated polypeptide or protein, and having biased affinity for the glycan through a boronic acid linked to a nucleosidic base of a nucleotide(s). The disclosure further encompasses methods for isolating an aptamer(s) selectively binding a target glycosylated polypeptide, where, from a population of randomized oligonucleotides that have at least one nucleotide having a boronic acid label linked to a base, is selected a first subpopulation of aptamers binding to the target glycosylated polypeptide or protein. This subpopulation is then amplified without using boronic acid-modified TTP, and amplification products not binding to a target glycosylated polypeptide or protein are selected. The second subpopulation of aptamers is then amplified using boronic acid-modified TTP to provide a population of boronic acid-modified aptamers capable of selectively binding to a glycosylation site of a target polypeptide or protein. Other aspects of the disclosure encompass methods for the use of the modified aptamers to detect glycosylated species of a polypeptide or protein.
本公开涵盖了选择性结合目标糖基化
多肽或蛋白质的寡核苷酸适
配体,并且通过
硼酸与一个或多个核苷酸碱基连接的方式对糖基具有偏倚亲和力。该公开还涵盖了一种用于分离选择性结合目标糖基化
多肽的适
配体的方法,其中从具有至少一个核苷酸具有
硼酸标记连接到碱基的随机寡核苷酸群体中,选择了第一个结合到目标糖基化
多肽或蛋白质的适
配体亚群。然后,这个亚群体被放大,而不使用
硼酸修饰的
TTP,并选择不结合到目标糖基化
多肽或蛋白质的放大产物。然后,使用
硼酸修饰的
TTP放大第二个适
配体亚群,以提供一种能够选择性结合到目标
多肽或蛋白质的糖基化位点的
硼酸修饰适
配体群体。该公开的其他方面涵盖了使用修改后的适
配体来检测
多肽或蛋白质的糖基化物种的方法。