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. 1988 Dec;85(23):8895–8899. doi: 10.1073/pnas.85.23.8895

A nuclease that cuts specifically in the ribosome binding site of some T4 mRNAs.

M Uzan 1, R Favre 1, E Brody 1
PMCID: PMC282613  PMID: 3057495

Abstract

We have identified a nucleolytic activity in Escherichia coli infected by bacteriophage T4 that introduces cuts in the ribosome binding site of at least two T4 mRNAs. Cutting takes place specifically in the GGAG sequences that are complementary to the 3' end of 16S rRNA (Shine-Dalgarno sequence). The nature of this nucleolytic cut has been investigated by reverse transcriptase mapping, anti-mRNA mapping, utilization of the vaccinia virus guanylyltransferase, and labeling by polynucleotide kinase. We have compared the sequences of target mRNAs with an mRNA of similar sequence but that is not a substrate for the nuclease. This allowed us to narrow down the possibilities for sequence elements that determine nuclease recognition. We hypothesize that this nuclease plays a physiological role in the inhibition of expression of a class of phage proteins.

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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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