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Related Experiment Video

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Peptide-based Identification of Functional Motifs and their Binding Partners
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A general method for chemogenetic control of peptide function.

Jiaqi Shen1,2, Lequn Geng1,2, Xingyu Li1,3,4

  • 1Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA.

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|December 9, 2022
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Summary
This summary is machine-generated.

Chemically activated protein domains (CAPs) enable precise control over peptide function. This system blocks peptide activity until a small molecule trigger is added, proving effective in cells and animals.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Peptides are crucial for biological functions.
  • Controlling peptide activity spatially and temporally is essential for cellular processes.
  • Existing methods for peptide activation may lack general applicability or precise control.

Purpose of the Study:

  • To develop a general method for chemical-dependent activation of short peptides.
  • To create a system for controlling peptide accessibility at both N- and C-termini.
  • To demonstrate the utility of this system in diverse biological contexts.

Main Methods:

  • Directed evolution of FK506-binding protein to create chemically activated protein domains (CAPs).
  • Fusion of peptides to CAPs to inhibit their function.
  • Displacement of CAPs by small molecules to restore peptide activity.
  • Testing CAPs with various peptides (protease cleavage site, dimerization heptapeptide, nuclear localization signal, opioid peptide).

Main Results:

  • Developed CAPs that bind to N- and C-termini of peptides, blocking their function.
  • Achieved chemical-dependent activation with up to 156-fold change.
  • Demonstrated broad applicability across different peptide types.
  • Successfully utilized the CAPs system in cell cultures and in vivo across multiple organs.

Conclusions:

  • CAPs provide a versatile platform for inducible control of peptide function.
  • This system allows for precise spatial and temporal regulation of cellular processes via peptides.
  • CAPs hold potential for applications in chemical biology, drug delivery, and synthetic biology.