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Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides
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Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

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Disordered flanks prevent peptide aggregation.

Sanne Abeln1, Daan Frenkel

  • 1FOM Institute for Atomic and Molecular Physics, Amsterdam, The Netherlands. s.abeln@amolf.nl

Plos Computational Biology
|December 20, 2008
PubMed
Summary
This summary is machine-generated.

Disordered protein regions adjacent to binding motifs prevent peptide aggregation. These intrinsically disordered regions maintain signaling peptide stability and enable reversible binding, explaining their prevalence in eukaryotes.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Eukaryotic proteins frequently contain natively unstructured or disordered regions.
  • These disordered regions are often found adjacent to small linear binding motifs.
  • The functional role of these flanking disordered regions remains largely unclear.

Purpose of the Study:

  • To investigate the role of intrinsically disordered regions flanking small linear binding motifs.
  • To understand how disordered regions influence the aggregation and stability of binding motifs.
  • To explore the impact of disordered regions on the binding free energy and reversibility of motifs.

Main Methods:

  • Utilized Monte Carlo simulations with a coarse-grained model.
  • Simulated small hydrophobic peptides with and without disordered flanking sequences.
  • Analyzed peptide aggregation, micelle formation, and binding free energy.

Main Results:

  • Peptides without disordered flanks aggregated under conditions where flanked peptides remained stable as monomers or small clusters.
  • Disordered regions significantly reduced peptide aggregation.
  • Binding free energy of the motif was only slightly affected by flanking disordered regions, but sensitive to motif entropy loss upon binding.

Conclusions:

  • Disordered regions adjacent to binding motifs serve as an anti-aggregation mechanism for signaling peptides.
  • This mechanism is distinct from general protein folding pathways.
  • The findings provide a testable hypothesis for the widespread occurrence of disordered regions in proteins.