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A consensus sequence for the Rhodospirillaceae SOS operators

M Labazi1, A del Rey, A R Fernandez de Henestrosa

  • 1Department of Genetics and Microbiology, Faculty of Sciences, Autonomous University of Barcelona, Bellaterra, Spain.

FEMS Microbiology Letters
|February 13, 1999
PubMed
Summary

Researchers identified key DNA sequences controlling the SOS DNA repair system genes recA and uvrA in Rhodobacter capsulatus. These specific DNA motifs are crucial for gene activation following DNA damage, revealing a conserved operator site in related bacteria.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • The SOS DNA repair system is a crucial cellular response to DNA damage in bacteria.
  • Understanding the regulation of SOS genes like recA and uvrA is vital for comprehending bacterial resilience.
  • Rhodobacter species possess complex regulatory mechanisms for DNA repair.

Purpose of the Study:

  • To identify the specific DNA sequences that control the expression of recA and uvrA genes in Rhodobacter capsulatus.
  • To elucidate the role of these sequences in the DNA damage-inducible expression of SOS genes.
  • To determine the conserved SOS operator sequence within the Rhodospirillaceae family.

Main Methods:

  • Polymerase chain reaction (PCR) mutagenesis was employed to investigate gene expression.

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  • Sequence analysis and alignment of promoter regions from related bacterial species were performed.
  • Identification of specific DNA motifs (e.g., GTTCN7GTAC, GAACN7GAAC, GTTCN7GTTC) upstream of target genes.

    • Main Results:

    • Specific DNA motifs upstream of recA and uvrA genes were identified as essential for their induction upon DNA damage.
    • The GTTCN7GTAC and GAACN7GAAC motifs are required for recA gene induction.
    • The GTTCN7GTTC motif is necessary for uvrA gene induction.
    • A consensus SOS operator sequence, GTTCVYVYTWTGTTC, was identified across Rhodospirillaceae recA and uvrA promoters.

    Conclusions:

    • The identified DNA motifs are critical regulatory elements for the SOS response in Rhodobacter capsulatus.
    • The conserved GTTCVYVYTWTGTTC sequence represents the SOS operator site in the Rhodospirillaceae family.
    • This finding enhances our understanding of bacterial DNA repair mechanisms and their regulation.