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Area of Science:

  • Bacteriology
  • Molecular Biology
  • Genetics

Background:

  • The bacterial SOS response is a key pathway in antibiotic resistance development.
  • RecA and LexA proteins mediate SOS response activation through their interaction.
  • Understanding the minimal RecA structure for LexA cleavage is crucial but challenging.

Purpose of the Study:

  • To define the minimal RecA filament required for LexA binding and cleavage.
  • To investigate the roles of ATP and single-stranded DNA (ssDNA) in SOS activation.
  • To challenge existing models of the SOS activation signal.

Main Methods:

  • Utilized head-to-tail linked and end-capped RecA constructs.
  • Assessed ssDNA binding, LexA binding, and LexA cleavage capabilities of RecA constructs.
  • Investigated the necessity of ATP and ssDNA for RecA-mediated LexA cleavage.

Main Results:

  • As few as three linked RecA units can bind ssDNA and LexA, leading to LexA cleavage.
  • RecA oligomerization alone is insufficient for LexA cleavage.
  • ATP and ssDNA binding are essential for forming a competent SOS activation signal with minimal RecA constructs.

Conclusions:

  • The minimal functional RecA filament for SOS activation is smaller than previously thought.
  • This study provides a refined model for the SOS activation signal, highlighting the necessity of ATP and ssDNA.
  • The findings offer a novel tool to target the SOS response and potentially slow antibiotic resistance.