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Calmodulin-dependent Signaling01:16

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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Oligopeptide Competition Assay for Phosphorylation Site Determination
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Published on: May 18, 2017

Minimum protein oscillator based on multisite phosphorylation∕dephosphorylation.

S Marjan Varedi K1, P J Woolf, X N Lin

  • 1University of Michigan, Department of Chemical Engineering, Ann Arbor, USA.

IET Systems Biology
|January 26, 2011
PubMed
Summary
This summary is machine-generated.

A novel protein oscillator uses a multisite protein in a negative feedback loop to generate oscillations. This design, featuring cooperative inhibition, offers a simple, robust, and tunable synthetic biology tool.

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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
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Area of Science:

  • Biochemistry
  • Systems Biology
  • Synthetic Biology

Background:

  • Protein phosphorylation is a key regulatory mechanism in cellular processes.
  • Oscillatory biological systems are crucial for various cellular functions.
  • Designing synthetic biological oscillators is an active area of research.

Purpose of the Study:

  • To propose and demonstrate a minimal protein oscillator based on multisite phosphorylation.
  • To investigate the conditions required for oscillation in such a system.
  • To explore the tunability and characteristics of the proposed synthetic oscillator.

Main Methods:

  • Theoretical modeling of a protein phosphorylation system with a negative feedback loop.
  • Analysis of the cooperative inhibition mechanism by a fully phosphorylated substrate.
  • Investigation of the role of non-linearity, substrate/enzyme ratio, and number of phosphorylation sites.

Main Results:

  • A novel minimal protein oscillator design is proposed, utilizing a multisite protein.
  • Oscillatory behavior is achieved when the fully phosphorylated substrate cooperatively inhibits the initial phosphorylation step.
  • Undamped oscillations require specific thresholds for feedback non-linearity and substrate/enzyme ratio.
  • An inverse relationship exists between the number of phosphorylation sites and the required feedback non-linearity.

Conclusions:

  • Multisite proteins can function as the core component of simple, robust, and tunable synthetic protein oscillators.
  • The number of phosphorylation sites and substrate/enzyme ratio primarily determine oscillation period and amplitude.
  • This work provides a foundation for constructing novel synthetic biological circuits.