The present invention relates to a synthetic immunogen represented by the general formula 1, useful for generating long lasting protective immunity against various intracellular pathogens which are the causative agents of tuberculosis, leishmaniasis, AIDS, trypanosomiasis, malaria and also allergy, cancer and a process for the preparation thereof. The developed immunogen is able to circumvent HLA restriction in humans and livestock. The invention further relates to a vaccine comprising the said immunogen for generating enduring protective immunity against various diseases. The said vaccine is targeted against intracellular pathogens, more particularly the pathogen
M. tuberculosis
in this case. In the present invention, promiscuous peptides of
M. tuberculosis
are conjugated to TLR ligands especially; Pam2Cys to target them mainly to dendritic cells and therefore elicit long-lasting protective immunity. (The formula (I) should be inserted here) General formula (I) wherein, X
1
=a promiscuous CD4 T helper epitope selected from SEQ ID No. 1 to 98 OR nil; X
2
=a promiscuous CD8 T cytotoxic epitope selected from SEQ ID No. 99 to 103 OR nil; when X1=nil; X2=SEQ ID No. 99 to 103 and when X2=nil; X1=SEQ ID No. 1 to 98; Y=Lysine; and S=Serine.
本发明涉及一种由通式1表示的合成免疫原,可用于产生长期的保护性免疫力,以对抗导致结核病、利什曼病、艾滋病、锥虫病、疟疾、过敏和癌症等各种细胞内病原体。所开发的免疫原能够规避人类和家畜的H
LA限制。本发明还涉及一种包括所述免疫原的疫苗,用于产生长期的保护性免疫力以对抗各种疾病。该疫苗针对细胞内病原体,特别是在本例中的M. tuberculosis病原体。在本发明中,M. tuberculosis的杂交肽与TLR
配体(尤其是Pam2Cys)结合,主要靶向树突状细胞,从而引发长期的保护性免疫力。(公式(I)应在此处插入)通式(I)其中,X1 =
SEQ ID No. 1至98或nil中选择的杂交C
D4 T辅助表位;X2 =
SEQ ID No. 99至103或nil中选择的杂交CD8 T细胞毒性表位;当X1 = nil时,X2 =
SEQ ID No. 99至103,当X2 = nil时,X1 =
SEQ ID No. 1至98;Y = 赖
氨酸;S =
丝氨酸。