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    •   RIUMA Principal
    • Investigación
    • Biología Celular, Genética y Fisiología - (BCGF)
    • BCGF - Contribuciones a congresos científicos
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    •   RIUMA Principal
    • Investigación
    • Biología Celular, Genética y Fisiología - (BCGF)
    • BCGF - Contribuciones a congresos científicos
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    Thymine starvation causes abortive initiation of chromosome replication critical for cell death in Escherichia coli

    • Autor
      Guzmán Cabañas, Elena; Viguera-Minguez, EnriqueAutoridad Universidad de Málaga; Mata Martín, Carmen
    • Fecha
      2013-09-04
    • Editorial/Editor
      SEBBM
    • Palabras clave
      Biología molecular; Bioquímica
    • Resumen
      Thymineless death (TLD), a phenomenon in which thymine auxotrophy becomes lethal when cells are starved for thymine, can be prevented by rifampicin addition. In this work, we have obtained evidence indicating that among the effects of RNA polymerase inhibition by rifampicin, the inhibition of chromosomal replication initiation is the process responsible for TLD suppression. We show that diminishing, abolishing or increasing the transcription level around oriC alleviates TLD by limiting the chromosomal initiation capacity (ChIC) generated under thymine starvation. TLD suppression was eliminated by DnaA inactivation or the deletion in the left half of the replication origin or deletion of the DnaA-boxes located in the right half of the oriC region. In accordance with these data, two-dimensional DNA electrophoresis gels showed an accumulation of simple-Y and bubble arc replication intermediates, as well as recombination structures at the oriC region during thymine starvation. None of these structures were observed under genetic or physiological conditions that suppress TLD. These results demonstrate that abortive initiations of chromosome replication occur under thymine starvation, supporting the idea that these events are a critical target for the lethal damage caused by thymine starvation and that results in TLD.
    • URI
      http://hdl.handle.net/10630/6019
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    Ficheros
    AbstractVigueraSEBBM2013.pdf (127.3Kb)
    Colecciones
    • BCGF - Contribuciones a congresos científicos

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    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
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    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA
    REPOSITORIO INSTITUCIONAL UNIVERSIDAD DE MÁLAGA