An isolated immunostimulatory oligonucleotide comprising two or more unmethylated CpG dinucleotides, and having a sequence including the following formula:
5'N1X1X2CGTTN23'
wherein the immunostimulatory oligonucleotide includes a modified backbone, at least one nucleotide separates consecutive CpGs, X1X2 is GpT or ApT, N1 is any nucleotide that includes a 5' TC or TG, N1 + N2 is from 0-26 bases, and the immunostimulatory oligonucleotide is from 8-30 bases in length and begins with TC or TG at the 5' end, with the proviso that neither N1 nor N2 contains a CCGG quadmer or more than one CCG or CGG trimer.
一种分离的免疫刺激寡核苷酸,包含两个或多个未甲基化的 CpG 二核苷酸,其序列包括下式:
5'N1X1X2CG
TTN23'
其中,免疫刺激寡核苷酸包括修饰的骨架,至少有一个核苷酸将连续的 CpGs 分开,X1X2 是 GpT 或 ApT,N1 是包括 5' TC 或 TG 的任何核苷酸,N1 + N2 是 0-26 个碱基、免疫刺激寡核苷酸长度为 8-30 个碱基,5'端以 TC 或 TG 开头,但 N1 和 N2 均不包含 CCGG 四聚体或一个以上的 CCG 或 CGG 三聚体。