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RAS BiologyБиохимия Biochemistry

  • ISSN (Print) 0320-9725
  • ISSN (Online) 3034-5294

DNA SUPERCOILING ALLEVIATES COLD-SENSITIVITY OF PROMOTER MELTING BY EXTREMOPHILIC Deinococcus-Thermus RNA POLYMERASES

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PII
S30345294S0320972525080099-1
DOI
10.7868/S3034529425080099
Publication type
Article
Status
Published
Authors
A.V. Kulbachinskiy
  • Affiliation:
    National Research Center "Kurchatov Institute"
    Institute of Gene Biology, Russian Academy of Sciences
Volume/ Edition
Volume 90 / Issue number 8
Pages
1189-1200
Abstract
Melting of promoter DNA around the transcription start site (TSS) is a critical step of transcription required for initiation of RNA synthesis. In bacteria, promoter melting is achieved by the holoenzyme of RNA polymerase (RNAP) consisting of the catalytic core enzyme and a promoter recognition subunit, the σ factor. Previously, we showed that RNAPs from thermophilic and mesophilic are unable to open promoters at ambient temperatures and require heating for DNA melting. These properties depend on their σ factors and are recapitulated in hybrid holoenzymes including these σ factors and the core enzyme of . Here, we show that DNA supercoiling alleviates the observed cold-sensitivity of promoter opening by Deinococcus-Thermus RNAPs and by hybrid holoenzymes and allows melting of the transcription start site at the same temperatures as in the case of RNAP. Supercoiling also suppresses salt sensitivity of promoter complexes formed by these RNAPs. The results demonstrate that RNAPs from Deinococcus-Thermus species are sensitive to DNA supercoiling and suggest that they can be rapidly switched-off or activated by the supercoiling state of the host genomes.
Keywords
РНК-полимераза Deinococcus radiodurans сверхспирализация ДНК плавление промотора устойчивость к стрессу
Date of publication
17.06.2025
Year of publication
2025
Number of purchasers
0
Views
78

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