Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Tracking the amyloidogenic core of IAPP amyloid fibrils: Insights from micro-Raman spectroscopy
Δημιουργός/Συγγραφέας:	Louros N.N. Tsiolaki P.L. Baltoumas F.A. [EL] Χρυσικός, Γεώργιος Δ.[EN] Chryssikos, Georgios D. [EL] Γκιώνης, Βασίλης[EN] Gionis, Vassilis Hamodrakas S.J. Iconomidou V.A.
Εκδότης:	Academic Press Inc.
Ημερομηνία:	2017
Γλώσσα:	Αγγλικά
ISSN:	1047-8477
DOI:	10.1016/j.jsb.2017.06.002
Άλλο:	PubMed ID: 28602716
Περίληψη:	Human islet amyloid polypeptide (hIAPP) is the major protein component of extracellular amyloid deposits, located in the islets of Langerhans, a hallmark of type II diabetes. The underlying mechanisms of IAPP aggregation have not yet been clearly defined, although the highly amyloidogenic sequence of the protein has been extensively studied. Several segments have been highlighted as aggregation-prone regions (APRs), with much attention focused on the central 8–17 and 20–29 stretches. In this work, we employ micro-Raman spectroscopy to identify specific regions that are contributing to or are excluded from the amyloidogenic core of IAPP amyloid fibrils. Our results demonstrate that both the N-terminal region containing a conserved disulfide bond between Cys residues at positions 2 and 7, and the C-terminal region containing the only Tyr residue are excluded from the amyloid core. Finally, by performing detailed aggregation assays and molecular dynamics simulations on a number of IAPP variants, we demonstrate that point mutations within the central APRs contribute to the reduction of the overall amyloidogenic potential of the protein but do not completely abolish the formation of IAPP amyloid fibrils.
Τίτλος πηγής δημοσίευσης:	Journal of Structural Biology
Τόμος/Κεφάλαιο:	199
Τεύχος:	2
Σελίδες:	140-152
Θεματική Κατηγορία:	[EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry [EL] Φασματοσκοπία[EN] Spectroscopy
Λέξεις-Κλειδιά:	Aggregation-prone peptides Amylin Amyloidosis Disulfide bonds Raman Spectroscopy Type II diabetes
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2017 Elsevier Inc.
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο