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Frequency-preference response in covalent modification cycles under substrate sequestration conditions.

Juliana Reves Szemere1, Horacio G Rotstein2, Alejandra C Ventura3,4

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Summary
This summary is machine-generated.

Covalent modification cycles (CMCs) exhibit signal termination when enzymes and substrates are abundant. This behavior creates band-pass filters, unlike the low-pass filters previously observed in cell signaling systems.

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Area of Science:

  • Biochemistry
  • Systems Biology
  • Cell Signaling

Background:

  • Covalent modification cycles (CMCs) are fundamental to cellular signaling.
  • Previous studies focused on substrate-excess conditions, overlooking enzyme-excess scenarios.
  • In vivo protein abundance suggests enzymes and substrates often exist at comparable concentrations.

Purpose of the Study:

  • To characterize signal termination in CMCs under enzyme-excess conditions.
  • To investigate the frequency response of CMCs subjected to periodic stimulation.
  • To explore the dynamic mechanisms and implications for cellular signaling cascades.

Main Methods:

  • Mathematical modeling of CMCs in the enzyme-excess regime.
  • Analysis of signal termination phenomena.
  • Frequency response analysis under periodic stimulation.

Main Results:

  • Signal termination occurs in CMCs when enzymes and substrates are present in comparable concentrations.
  • These CMCs function as band-pass filters, a novel finding compared to previously reported low-pass filters.
  • The study elucidates the dynamic mechanisms linking signal termination to preferred frequency responses.

Conclusions:

  • Enzyme-excess conditions and substrate sequestration significantly alter CMC dynamics.
  • Signal termination and band-pass filtering are crucial, overlooked features of cellular signaling.
  • These findings have implications for understanding cellular adaptation and signal processing in biological systems.