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2015 ; 6
(ä): 7831
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Infrared nanospectroscopy characterization of oligomeric and fibrillar aggregates
during amyloid formation
#MMPMID26215704
Ruggeri FS
; Longo G
; Faggiano S
; Lipiec E
; Pastore A
; Dietler G
Nat Commun
2015[Jul]; 6
(ä): 7831
PMID26215704
show ga
Amyloids are insoluble protein fibrillar aggregates. The importance of
characterizing their aggregation has steadily increased because of their link to
human diseases and material science applications. In particular, misfolding and
aggregation of the Josephin domain of ataxin-3 is implicated in spinocerebellar
ataxia-3. Infrared nanospectroscopy, simultaneously exploiting atomic force
microscopy and infrared spectroscopy, can characterize at the nanoscale the
conformational rearrangements of proteins during their aggregation. Here we
demonstrate that we can individually characterize the oligomeric and fibrillar
species formed along the amyloid aggregation. We describe their secondary
structure, monitoring at the nanoscale an ?-to-? transition, and couple these
studies with an independent measurement of the evolution of their intrinsic
stiffness. These results suggest that the aggregation of Josephin proceeds from
the monomer state to the formation of spheroidal intermediates with a native
structure. Only successively, these intermediates evolve into misfolded
aggregates and into the final fibrils.