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. 1982 Mar 25;10(6):2163–2174. doi: 10.1093/nar/10.6.2163

Structural requirements of (2'-5') oligoadenylate for protein synthesis inhibition in human fibroblasts.

J L Drocourt, C W Dieffenbach, P O Ts'o, J Justesen, M N Thang
PMCID: PMC320596  PMID: 7079179

Abstract

The structural requirements of (2'-5')-oligoadenylic acid (pppA(2'p5'A)x, X greater than or equal to 1 or (2'-5'An) for inhibition of protein synthesis in cells were examined with a modified calcium-coprecipitation technique, using a series of trinucleotide analogs (pppA2'p5'A2'p5'N, N=rC, rG, rU, T, dC, dG, dA). In this system both the degree and the duration of the inhibition of protein synthesis were dependent on the added concentration of (2'-5')A3. Of all the heterotrimers, only the deoxy A derivative was active as an inhibitor of protein synthesis, while the other members of the analog series were found to have no inhibitory effects. In competition experiments between (2'-5')A3 and the non-active analogs, three heterotrimers were shown to reduce the activity of (2'-5')A3 in protein inhibition. In contrast, the dephosphorylated (2'-5')A3 had no inhibitory effect and was not effective in blocking (2'-5')A3. These results indicate that the 5'-terminal triphosphate is important for binding of (2'-5')A3 to the site of (2'-5')An action and the adenine base at the 2'-terminus is important for activating the machinery responsible for protein synthesis inhibition in the cells, most likely the (2'-5')An-activated nuclease.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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