2-Methyladenosine-substituted analogues of 2-5A, p5'A2'p5'A2'p5'(me(2)A), p5'(me(2)A)2'p5'A2'p5'A, and p5'(me(2)A) 2'p5'(me(2)A)2'p5'(me(2)A), were prepared via a modification of a lead ion-catalyzed ligation reaction. These 5'-monophosphates were subsequently converted into the corresponding 5'-triphosphates. Both binding and activation of human recombinant RNase L by various 2-methyladenosine-substituted 2-5A analogues were examined. Among the 2-5A analogues, p5'A2'p5'A2'p5'(me(2)A) showed the strongest binding affinity and was as effective as 2-5A itself as an activator of RNase L. The CD spectra of both p5'(me(2)A)2'p5'A2'p5'A and p5'A2'p5'A2'p5'(me(2)A) were superimposable on that of p5'A2'p5'A2'p5'A. indicative of an anti orientation about the base-glycoside bonds as in naturally occurring 2-5A. (C) 2000 Elsevier Science Ltd. All rights reserved.
机构:
Section on Biomedical Chemistry, Laboratory of Medicinal Chemistry, National Institutes of Health, Bethesda, MD 20892, United States
Codon Pharmaceuticals, Inc., 200 Perry Parkway, Gaithersburg, MD 20877, United StatesSection on Biomedical Chemistry, Laboratory of Medicinal Chemistry, National Institutes of Health, Bethesda, MD 20892, United States
Lesiak, Krystyna
Torrence, Paul F.
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Section on Biomedical Chemistry, Laboratory of Medicinal Chemistry, National Institutes of Health, Bethesda, MD 20892, United StatesSection on Biomedical Chemistry, Laboratory of Medicinal Chemistry, National Institutes of Health, Bethesda, MD 20892, United States