To elucidate the antibody-(2'-5')oligoadenylate relation to the mode of the hapten-immunogen conjugation, a new (2'-5')oligoadenylic acid trimer derivative containing a 2'-terminal N6-(5-carboxypentyl)adenosine and its 125I-labeled immunogenic conjugate were synthesized. The immunization with this conjugate and with a conjugate based on the 2',3'-O-[1-(2-carboxyethyl)]ethylidene derivative of the (2'-5')triadenylic acid gave antisera with different affinities toward modified (2'-5')oligonucleotides. Epitopes involved in the (2'-5')oligomer-binding to different antisera were found.
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