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RcsF-independent mechanisms of signaling within the Rcs phosphorelay.

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|December 26, 2024
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The Rcs phosphorelay responds to cell envelope stress. This study reveals novel RcsF-independent activation mechanisms, including the inner membrane protein DrpB, expanding our understanding of this crucial bacterial stress response.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • The regulator of capsule synthesis (Rcs) phosphorelay is a key stress response in enterobacteria, triggered by cell envelope perturbations.
  • RcsF acts as the primary sensor, initiating signaling through interactions with IgaA and RcsD.

Purpose of the Study:

  • To investigate Rcs phosphorelay activation independent of its known sensor, RcsF.
  • To characterize the mechanisms of three distinct RcsF-independent inducers.

Main Methods:

  • Investigated Rcs cascade activation in E. coli under conditions lacking RcsF.
  • Analyzed the roles of DsbA, DjlA, and DrpB in Rcs signaling.
  • Characterized protein interactions involving IgaA, RcsD, and RcsC.

Main Results:

  • Identified the inner membrane protein DrpB as a novel, multicopy Rcs activator.
  • Showed that DsbA loss-of-function and DjlA overexpression weaken IgaA-RcsD interactions.
  • Demonstrated that DrpB activation requires the RcsC periplasmic domain, unlike RcsF-dependent signaling.

Conclusions:

  • The Rcs phosphorelay can be activated through RcsF-independent pathways.
  • Different inducers utilize distinct mechanisms to modulate IgaA-RcsD interactions.
  • The RcsC periplasmic domain may function as a sensor for specific Rcs signals, particularly those involving DrpB.