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. 1999 Jul;5(7):972–985. doi: 10.1017/s1355838299990398

Roles of polyadenylation and nucleolytic cleavage in the filamentous phage mRNA processing and decay pathways in Escherichia coli.

A F Goodrich 1, D A Steege 1
PMCID: PMC1369821  PMID: 10411140

Abstract

To define basic features of mRNA processing and decay in Escherichia coli, we have examined a set of mRNAs encoded by the filamentous phage f1 that have structures typical of bacterial mRNAs. They bear a stable hairpin stem-loop on the 3' end left from rho-independent termination and are known to undergo processing by RNase E. A small percentage of the f1 mRNAs were found to bear poly(A) tails that were attached to heterogeneous positions near the common 3' end. In a poly(A) polymerase-deficient host, the later-appearing processed mRNAs were stabilized, and a novel small RNA accumulated. This approximately 125-nt RNA proved to arise via RNase E cleavage from the 3'-terminal region of the mRNAs bearing the terminator. Normally ribosomes translating gene VIII appear to protect this cleavage site from RNase E, so that release of the fragment from the mRNAs occurs very slowly. The data presented define additional steps in the f1 mRNA processing and decay pathways and clarify how features of the pathways are used in establishing and maintaining the persistent filamentous phage infection. Although the primary mode of decay is endonucleolytic cleavage generating a characteristic 5' --> 3' wave of products, polyadenylation is involved in part in degradation of the processed mRNAs and is required for turnover of the 125-nt mRNA fragment. The results place polyadenylation at a later rather than an initiating step of decay. They also provide a clear illustration of how stably structured RNA 3' ends act as barriers to 3' --> 5' exonucleolytic mRNA decay.

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Selected References

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