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2015 ; 5
(ä): 15485
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Early aggregation preceding the nucleation of insulin amyloid fibrils as
monitored by small angle X-ray scattering
#MMPMID26503463
Chatani E
; Inoue R
; Imamura H
; Sugiyama M
; Kato M
; Yamamoto M
; Nishida K
; Kanaya T
Sci Rep
2015[Oct]; 5
(ä): 15485
PMID26503463
show ga
The nucleation event of amyloid fibrils is one of the most crucial processes that
dictate the timing and rate of the pathology of diseases; however, information
regarding how protein molecules associate to produce fibril nuclei is currently
limited. In order to explore this issue in more detail, we performed
time-resolved small angle X-ray scattering (SAXS) measurements on insulin
fibrillation, in combination with additional multidirectional analyses of
thioflavin T fluorescence, FTIR spectroscopy, light scattering, and light
transmittance, during the fibrillation process of bovine insulin. SAXS monitoring
revealed that insulin molecules associated into rod-like prefibrillar aggregates
in the very early stage of the reaction. After the formation of these early
aggregates, they appeared to further coalesce mutually to form larger clusters,
and the SAXS profiles subsequently showed the further time evolution of
conformational development towards mature amyloid fibrils. Distinct types of
structural units in terms of shape in a nano-scale order, cross-? content, and
thioflavin T fluorescence intensity were observed in a manner that was dependent
on the fibrillation pathways. These results suggest the presence of diverse
substructures that characterize various fibrillation pathways, and eventually,
manifest polymorphisms in mature amyloid fibrils.