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An amplified derepression controller with multisite inhibition and positive feedback.

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Robust homeostasis is maintained by novel controller motifs that utilize derepression kinetics. These amplified controllers, featuring multisite inhibition and positive feedback, overcome limitations of previous models and are found in plant circadian clocks.

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Area of Science:

  • Systems Biology
  • Biochemical Engineering
  • Control Theory

Background:

  • Organismal homeostasis relies on robust controller motifs.
  • Existing motifs show limitations with time-dependent perturbations.
  • Derepression-based controllers handle growing perturbations but can break down.

Purpose of the Study:

  • To develop enhanced derepression-based controllers that overcome previous limitations.
  • To investigate the role of multisite inhibition and positive feedback loops.
  • To identify natural occurrences of these amplified controller motifs.

Main Methods:

  • Theoretical modeling combining control engineering and kinetic concepts.
  • Analysis of controller performance under various perturbation types.
  • Bioinformatic search for the identified motif in natural systems.

Main Results:

  • A novel amplified controller motif based on derepression kinetics was designed.
  • Multisite inhibition and positive feedback prevent controller breakdown at low inhibitor concentrations.
  • The amplified feedback motif was identified within the plant circadian clock.

Conclusions:

  • The novel controller motif enhances robustness and overcomes limitations of prior models.
  • This motif represents a significant advancement in understanding biological homeostasis.
  • The presence in plant circadian clocks suggests functional importance in natural systems.