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. 1975 Aug;16(2):222–227. doi: 10.1128/jvi.16.2.222-227.1975

Polyamines in bacteriophage R17 and its RNA.

I Fukuma, S S Cohen
PMCID: PMC354658  PMID: 1097731

Abstract

Bacteriophage R17 and its RNA were found to contain significant amounts of spermidine but not of putrescine. When isolated at 0.01 M KCl, up to 1,000 molecules of spermidine were associated with the virion. The phage RNA isolated with phenol plus sodium lauryl sulfate contained approximately 70 to 90 molecules of spermidine. The association appeared to be ionic because the bound spermidine could be dissociated by KCl, MgCl2, or both. Effects of polyamines on in vitro translation were studied using both poly(U) and phage R17-RNA as mRNA. Addition of spermidine to the system at suboptimal concentrations of Mg2+ resulted in marked stimulations of the rate of protein synthesis. Putrescine alone had no effect but stimulated the incorporation in the presence of suboptimal concentrations of spermidine plus Mg2+. The isolated amino acid-incorporating system contained suboptimal soluble and bound polyamines. A comparison of incorporation was made in this system using R17-RNA with and without bound spermidine. No effects of these bound cations were detected on the rate or extent of incorporation of valine. The ratio of incorporation of histidine (present in non-coat proteins) to valine (total protein) revealed little difference as a functions of cation in the system or a function of the spermidine present in R17-RNA.

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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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