A pRNA-induced structural rearrangement triggers 6S-1 RNA release from RNA polymerase in Bacillus subtilis.
Identifieur interne : 001E05 ( PubMed/Curation ); précédent : 001E04; suivant : 001E06A pRNA-induced structural rearrangement triggers 6S-1 RNA release from RNA polymerase in Bacillus subtilis.
Auteurs : Benedikt M. Beckmann [Allemagne] ; Philipp G. Hoch ; Manja Marz ; Dagmar K. Willkomm ; Margarita Salas ; Roland K. HartmannSource :
- The EMBO journal [ 1460-2075 ] ; 2012.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : DNA-Directed RNA Polymerases, RNA, Bacterial.
- metabolism : Bacillus subtilis, DNA-Directed RNA Polymerases, RNA, Bacterial.
- Base Sequence, Molecular Sequence Data, Nucleic Acid Conformation, RNA, Untranslated.
Abstract
Bacillus subtilis 6S-1 RNA binds to the housekeeping RNA polymerase (σ(A)-RNAP) and directs transcription of short 'product' RNAs (pRNAs). Here, we demonstrate that once newly synthesized pRNAs form a sufficiently stable duplex with 6S-1 RNA, a structural rearrangement is induced in cis, which involves base-pairing between sequences in the 5'-portion of the central bulge and nucleotides that become available as a result of pRNA invasion. The rearrangement decreases 6S-1 RNA affinity for σ(A)-RNAP. Among the pRNA length variants synthesized by σ(A)-RNAP (up to ∼14 nt), only the longer ones, such as 12-14-mers, form a duplex with 6S-1 RNA that is sufficiently long-lived to induce the rearrangement. Yet, an LNA (locked nucleic acid) 8-mer can induce the same rearrangement due to conferring increased duplex stability. We propose that an interplay of rate constants for polymerization (k(pol)), for pRNA:6S-1 RNA hybrid duplex dissociation (k(off)) and for the rearrangement (k(conf)) determines whether pRNAs dissociate or rearrange 6S-1 structure to trigger 6S-1 RNA release from σ(A)-RNAP. A bioinformatic screen suggests that essentially all bacterial 6S RNAs have the potential to undergo a pRNA-induced structural rearrangement.
DOI: 10.1038/emboj.2012.23
PubMed: 22333917
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<term>Molecular Sequence Data</term>
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<front><div type="abstract" xml:lang="en">Bacillus subtilis 6S-1 RNA binds to the housekeeping RNA polymerase (σ(A)-RNAP) and directs transcription of short 'product' RNAs (pRNAs). Here, we demonstrate that once newly synthesized pRNAs form a sufficiently stable duplex with 6S-1 RNA, a structural rearrangement is induced in cis, which involves base-pairing between sequences in the 5'-portion of the central bulge and nucleotides that become available as a result of pRNA invasion. The rearrangement decreases 6S-1 RNA affinity for σ(A)-RNAP. Among the pRNA length variants synthesized by σ(A)-RNAP (up to ∼14 nt), only the longer ones, such as 12-14-mers, form a duplex with 6S-1 RNA that is sufficiently long-lived to induce the rearrangement. Yet, an LNA (locked nucleic acid) 8-mer can induce the same rearrangement due to conferring increased duplex stability. We propose that an interplay of rate constants for polymerization (k(pol)), for pRNA:6S-1 RNA hybrid duplex dissociation (k(off)) and for the rearrangement (k(conf)) determines whether pRNAs dissociate or rearrange 6S-1 structure to trigger 6S-1 RNA release from σ(A)-RNAP. A bioinformatic screen suggests that essentially all bacterial 6S RNAs have the potential to undergo a pRNA-induced structural rearrangement.</div>
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<Abstract><AbstractText>Bacillus subtilis 6S-1 RNA binds to the housekeeping RNA polymerase (σ(A)-RNAP) and directs transcription of short 'product' RNAs (pRNAs). Here, we demonstrate that once newly synthesized pRNAs form a sufficiently stable duplex with 6S-1 RNA, a structural rearrangement is induced in cis, which involves base-pairing between sequences in the 5'-portion of the central bulge and nucleotides that become available as a result of pRNA invasion. The rearrangement decreases 6S-1 RNA affinity for σ(A)-RNAP. Among the pRNA length variants synthesized by σ(A)-RNAP (up to ∼14 nt), only the longer ones, such as 12-14-mers, form a duplex with 6S-1 RNA that is sufficiently long-lived to induce the rearrangement. Yet, an LNA (locked nucleic acid) 8-mer can induce the same rearrangement due to conferring increased duplex stability. We propose that an interplay of rate constants for polymerization (k(pol)), for pRNA:6S-1 RNA hybrid duplex dissociation (k(off)) and for the rearrangement (k(conf)) determines whether pRNAs dissociate or rearrange 6S-1 structure to trigger 6S-1 RNA release from σ(A)-RNAP. A bioinformatic screen suggests that essentially all bacterial 6S RNAs have the potential to undergo a pRNA-induced structural rearrangement.</AbstractText>
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