2026-06-14T03:33:40Zhttps://repisalud.isciii.es/rest/oai/requestoai:repisalud.isciii.es:20.500.12105/166952024-11-28T12:36:26Zcom_20.500.12105_2052com_20.500.12105_2051col_20.500.12105_19609col_20.500.12105_25179
Repisalud
author
García-López, Míriam
author
Hernández, Pablo
author
Megías, Diego
author
Ferrandiz-Avellano, Maria-Jose
author
de la Campa, Adela G
funder
Agencia Estatal de Investigación (España)
funder
Ministerio de Ciencia e Innovación (España)
funder
Unión Europea. Fondo Europeo de Desarrollo Regional (FEDER/ERDF)
funder
Instituto de Salud Carlos III
2023-11-17T13:15:00Z
2023-11-17T13:15:00Z
2023-10-31
Int J Mol Sci. 2023 Oct 31;24(21):15800.
10.3390/ijms242115800
1422-0067
International journal of molecular sciences
37958782
http://hdl.handle.net/20.500.12105/16695
Topoisomerase I (TopoI) in Streptococcus pneumoniae, encoded by topA, is a suitable target for drug development. Seconeolitsine (SCN) is a new antibiotic that specifically blocks this enzyme. We obtained the topARA mutant, which encodes an enzyme less active than the wild type (topAWT) and more resistant to SCN inhibition. Likely due to the essentiality of TopoI, we were unable to replace the topAWT allele by the mutant topARA version. We compared the in vivo activity of TopoIRA and TopoIWT using regulated overexpression strains, whose genes were either under the control of a moderately (PZn) or a highly active promoter (PMal). Overproduction of TopoIRA impaired growth, increased SCN resistance and, in the presence of the gyrase inhibitor novobiocin (NOV), caused lower relaxation than TopoIWT. Differential transcriptomes were observed when the topAWT and topARA expression levels were increased about 5-fold. However, higher increases (10-15 times), produced a similar transcriptome, affecting about 52% of the genome, and correlating with a high DNA relaxation level with most responsive genes locating in topological domains. These results confirmed that TopoI is indeed the target of SCN in S. pneumoniae and show the important role of TopoI in global transcription, supporting its suitability as an antibiotic target.
eng
DNA supercoiling
DNA topoisomerase I
Seconeolitsine
Regulation of supercoiling
Transcriptional domains
Physiologic and Transcriptomic Effects Triggered by Overexpression of Wild Type and Mutant DNA Topoisomerase I in Streptococcus pneumoniae
research article
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PhysiologicTranscriptomicEffectsTriggered_2023.pdf
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Supplementary_PhysiologicTranscriptomicEffectsTriggered_2023.pdf
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PhysiologicTranscriptomicEffectsTriggered_2023.pdf.txt
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