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Peptides derived from two dynamically disordered proteins self-assemble into amyloid-like fibrils
Brian Bothner1, Yves Aubin, Richard W Kriwacki
1Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
Journal of the American Chemical Society
|March 13, 2003
Summary
Short peptides from cancer-associated proteins p14ARF and Hdm2 self-assemble into novel amyloid-like structures. This biomolecular assembly mechanism uses binary, extended beta-strands for potential nanostructure applications.
Area of Science:
- Biochemistry
- Molecular Biology
- Nanotechnology
Background:
- Cancer-associated proteins p14ARF and Hdm2 are crucial in cellular regulation.
- Amyloid structures are typically associated with diseases, but can also have biological functions.
Purpose of the Study:
- To investigate the self-assembly properties of short peptides derived from p14ARF and Hdm2.
- To explore the potential of these peptide assemblies as novel biomolecular nanostructures.
Main Methods:
- Peptide synthesis and characterization.
- In vitro assembly studies.
- Analysis of protein-protein interactions and structural transitions.
Main Results:
- Short peptides (14 and 15 amino acids) from p14ARF and Hdm2 co-assemble into amyloid-like structures.
- Larger protein domains containing these segments interact in cells and exhibit disorder-to-order transitions upon binding.
- A novel mechanism of biomolecular assembly via binary, extended beta-strands was identified, distinct from typical amyloid disease associations.
Conclusions:
- The self-assembly of p14ARF and Hdm2 peptides into beta-strand fibrils represents a new mode of biomolecular assembly.
- These peptide-formed fibrils offer potential for directed assembly of decorated fibrils for applications in biological nanostructures.