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Title: | Probing the sequence and structure of in vitro synthesized antisense and target RNAs from the replication control system of plasmid pMV158 |
Authors: | López-Aguilar, Celeste; Solar, Gloria del ![]() |
Keywords: | Antisense RNA Target RNA In vitro transcription T7RNA |
Issue Date: | 26-Mar-2013 |
Publisher: | Academic Press |
Citation: | Plasmid 70 (2013) 94–103 |
Abstract: | Antisense RNAII is a replication control element encoded by promiscuous plasmid pMV158. RNAII binds to its complementary sequence in the copG-repB mRNA, thus inhibiting translation of the replication initiator repB gene. In order to initiate the biochemical characterization of the pMV158 antisense RNA-mediated control system, conditions for in vitro transcription by T7RNA polymerase were set up that yielded large amounts of antisense and target run-off products able to bind to each other. The run-off antisense transcript was expected, and confirmed, to span the entire RNAII as synthesized by the bacterial RNA polymerase, including the intrinsic transcription terminator at its 3’-terminus. On the other hand, two different target transcripts, mRNA60 and mRNA80, were produced, characterized and tested for efficient binding to the antisense product. The mRNA60 and mRNA80 run-off transcripts supposedly spanned 60 and 80 nucleotides, respectively, on the copG-repB mRNA and lacked terminator-like structures at their 3’-termini. Probing of the sequence and conformation of the main products, along with modeling of their secondary structures, showed that both target transcripts were actually longer-than-expected, and contained a 3’-terminal hairpin wherein the extra nucleotides base-paired to the expected 3’-terminus of the corresponding run-off transcript. These longer products were proposed to arise from the RNA56 dependent polymerizing activity of T7RNA polymerase on correct run-off transcripts primed by extremely short 3’-selfcomplementarity. Seizing of the 58 target mRNA sequence complementary to the 5’-terminus of RNAII in a stable 3’-terminal hairpin generated by this activity seemed to cause a 3-fold decrease in the efficiency of binding to the antisense RNA. |
Description: | 26 p.-5 fig.-1 tab. |
Publisher version (URL): | http://dx.doi.org/10.1016/j.plasmid.2013.02.005 |
URI: | http://hdl.handle.net/10261/113566 |
DOI: | 10.1016/j.plasmid.2013.02.005 |
ISSN: | 0147-619X |
E-ISSN: | 1095-9890 |
Appears in Collections: | (CIB) Artículos |
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PLASMID_G. del Solar_2013.pdf | 343,02 kB | Adobe PDF | ![]() View/Open |
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