Laminated Morphology of Nontwisting beta-Sheet Fibrilis Constructed via Peptide Self-Assembly
A synthetic peptide has been de novo designed that self-assembles into {beta}-sheet fibrils exhibiting a nontwisted, stacked morphology. The stacked morphology is constituted by 2.5 nm wide filaments that laterally associate to form flat fibril laminates exceeding 50 nm in width and micrometers in length. The height of each fibril is limited to the length of exactly one peptide monomer in an extended {beta}-strand conformation, approximately 7 nm. Once assembled, these highly ordered, 2-D structures are stable over a wide range of pH and temperature and exhibit characteristics similar to those of amyloid fibrils. Furthermore, the rate of assembly and degree of fibril lamination can be controlled with kinetic parameters of pH and temperature. Finally, the presence of a diproline peptide between two {beta}-sheet-forming strands in the peptide sequence is demonstrated to be an important factor in promoting the nontwisting, laminated fibril morphology.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 913755
- Report Number(s):
- BNL-78323-2007-JA; JACSAT; TRN: US200804%%50
- Journal Information:
- J. Am. Chem. Soc., Vol. 127; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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