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2016 ; 11
(9
): e0161243
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English Wikipedia
Structural Characterization of Fibrils from Recombinant Human Islet Amyloid
Polypeptide by Solid-State NMR: The Central FGAILS Segment Is Part of the ?-Sheet
Core
#MMPMID27607147
Weirich F
; Gremer L
; Mirecka EA
; Schiefer S
; Hoyer W
; Heise H
PLoS One
2016[]; 11
(9
): e0161243
PMID27607147
show ga
Amyloid deposits formed from islet amyloid polypeptide (IAPP) are a hallmark of
type 2 diabetes mellitus and are known to be cytotoxic to pancreatic ?-cells. The
molecular structure of the fibrillar form of IAPP is subject of intense research,
and to date, different models exist. We present results of solid-state NMR
experiments on fibrils of recombinantly expressed and uniformly 13C, 15N-labeled
human IAPP in the non-amidated, free acid form. Complete sequential resonance
assignments and resulting constraints on secondary structure are shown. A single
set of chemical shifts is found for most residues, which is indicative of a high
degree of homogeneity. The core region comprises three to four ?-sheets. We find
that the central 23-FGAILS-28 segment, which is of critical importance for
amyloid formation, is part of the core region and forms a ?-strand in our sample
preparation. The eight N-terminal amino acid residues of IAPP, forming a
ring-like structure due to a disulfide bridge between residues C2 and C7, appear
to be well defined but with an increased degree of flexibility. This study
supports the elucidation of the structural basis of IAPP amyloid formation and
highlights the extent of amyloid fibril polymorphism.