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Replication of the ColE2 plasmid requires a plasmid-coded initiator protein (Rep). Rep expression is controlled by antisense RNA (RNAI) against the Rep mRNA at a translational step. In this paper, we examined the effects of host RNA degradation enzymes on the degradation process of the Rep mRNA and its degradation intermediates especially those carrying the 5′ untranslated region. We showed that the...
Replication of ColE1-type plasmids is regulated by RNAI, an antisense RNA that interacts with the replication pre-primer, RNAII. Exonucleolytic attack at the 3 ' end of RNAI is impeded in pcnB mutant bacteria, which lack poly(A) polymerase I-the principal RNA polyadenylase of E. coli; this leads to accumulation of an RNAI decay intermediate (RNAI -5 ) and dramatic reduction of...
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