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. 1981 Mar;78(3):1537–1541. doi: 10.1073/pnas.78.3.1537

Selective inhibition of Escherichia coli protein synthesis and growth by nonionic oligonucleotides complementary to the 3′ end of 16S rRNA*

Krishna Jayaraman 1, Kevin McParland 1, Paul Miller 1, Paul O P Ts'o 1
PMCID: PMC319166  PMID: 6165012

Abstract

A series of nonionic oligonucleotide analogues, the deoxyribooligonucleoside methylphosphonates, were synthesized. The base sequences of these compounds, d(ApGpGp), d(ApGpGp)2, and d[(ApGpGp)2T], are complementary to the Shine-Dalgarno sequence (-A-C-C-U-C-C-U-) found at the 3′ end of bacterial 16S rRNA. These nonionic oligonucleotide analogues were tested for their ability to inhibit the in vitro translation of mRNAs in cell-free systems of Escherichia coli and rabbit reticulocyte. In the E. coli system, both d(ApGpGp)2 and d[(ApGpGp)2T] effectively inhibited MS-2 RNA-directed protein synthesis but they had much less effect on either poly(U)- or poly(A)-directed polypeptide synthesis. In the reticulocyte system, these compounds had no significant effect on the translation of globin mRNA. The observation that d[(ApGpGp)2[3H]T)] binds to 70S ribosomes (association constant, 2.0 × 104 M-1, 37°C) together with the specificity of the inhibitory action of these compounds on protein synthesis strongly suggests that inhibition of translation is a consequence of analogue binding to Shine-Dalgarno sequence of 16S rRNA. The oligonucleoside methylphosphonates inhibited both protein synthesis (without concurrent inhibition of RNA synthesis) and colony formation by E. coli ML 308-225 (a permeable mutant) whose cell wall contains negligible quantities of lipopolysaccharide but had no effect on wild-type E. coli B. Our preliminary results on the uptake of oligodeoxyribonucleoside methylphosphonates by E. coli B show that these cells are not permeable to oligomers longer than 4 nucleotidyl units. Although oligodeoxyribonucleoside methylphosphonates are taken up by mammalian cells in culture, this series of analogues had negligible inhibitory effects on colony formation by transformed human cells. This study indicates that this class of nonionic oligonucleotide analogues can be used to probe and regulate the function and structure of nucleic acids of defined sequence within living cells.

Keywords: oligonucleoside methylphosphonates, chemical synthesis, ribosome binding, cell-free translation, cell growth

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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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