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Amyloid Fiber Formation by Synthetic Peptides Derived from the Sequence of the Protein CsgA of Escherichia coli

[ Vol. 20 , Issue. 8 ]

Author(s):

Pierre Lembre, Charlotte Vendrely and Patrick Di Martino   Pages 942 - 946 ( 5 )

Abstract:


We characterized the formation of amyloid fibers by two peptides derived from the CsgA sequence: R5 (133- 151) corresponding to the whole repeating unit R5 and a truncated form of this peptide called R5T (134-143). In the presence of either of the two peptides: an increase in the fluorescence intensity of Thioflavin T was observed; a shift of the absorbance of Congo red was measured; spontaneous formation of amyloid fibers was observed by polarized light as well asatomic force microscopy imaging. Large-size aggregates were observed with R5 while R5T formed fagots of individualized fibers. The infrared spectroscopy analysis revealed the presence of a greater number of intermolecular bonds for R5. In conclusion, a 10 aminoacids peptide derived from the R5 sequence was sufficient for the spontaneous formation of amyloid fibrils but not to form large-size aggregates of fibers.

Keywords:

Amyloïd, biofilm, CsgA, Curli, fiber, peptide.

Affiliation:

Laboratoire ERRMECe- EA1391, Institut des matériaux-FD4122, Université de Cergy-Pontoise, 2, av Adolphe Chauvin, 95302 Cergy-Pontoise Cedex, France.



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