PMID: 6165012Mar 1, 1981Paper

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

Proceedings of the National Academy of Sciences of the United States of America
K JayaramanP O Ts'o

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)(2)T], 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)(2)T] 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)[(3)H]T)] binds to 70S ribosomes (association constant, 2.0 x 10(4) M(-1), 37 degrees 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 inh...Continue Reading

References

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