title: The dynamic nature of amyloid beta (1-40) aggregation.
abstract: In this paper, we characterize the dynamic nature of the full amyloid beta (1-40) (Aβ (1-40)) aggregates. We labeled the peptide with either 5-carboxytetramethylrhodamine (TAMRA) or with fluorescein-isothiocyanate (FITC). The labeled peptides were mixed after separate fibrillization, and the dynamic changes in the structure of the fibrils were imaged using confocal microscopy. Fluorescence resonance energy transfer (FRET) measurements showed that the Aβ (1-40) peptides detach from and reattach to the fibrils in a biologically relevant timescale (days). With time, the two peptides mix at the molecular level. This process is concentration dependent and occurs primarily in the external parts of the aggregates with a half time between 4 and 7 days. This study shows that the combination of confocal microscopy and FRET analysis is a facile method for studying dynamic processes in supra-molecular aggregates.
authors: The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra, Givat Ram Campus, 91904 Jerusalem, Israel.
authors: Alik
authors: A
authors: Belitzky
authors: Naomi
authors: N
authors: Melamed-Book
authors: Aryeh
authors: A
authors: Weiss
authors: Uri
authors: U
authors: Raviv
mesh_terms: D016229:Amyloid beta-Peptides / Q000737:chemistry*; D031541:Fluorescence Resonance Energy Transfer; D005456:Fluorescent Dyes / Q000737:chemistry; D017879:Isothiocyanates / Q000737:chemistry; D018613:Microscopy, Confocal; D010446:Peptide Fragments / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry
chemical_list: C437523:5-carboxytetramethylrhodamine; D016229:Amyloid beta-Peptides; D005456:Fluorescent Dyes; D017879:Isothiocyanates; D010446:Peptide Fragments; D012235:Rhodamines; C078592:amyloid beta-protein (1-40); C037152:isothiocyanic acid