Chameleon ‘aggregation-prone’ segments of apoA-I: A model of amyloid fibrils formed in apoA-I amyloidosis

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Unit:
Library and Information Center
Title:
Chameleon ‘aggregation-prone’ segments of apoA-I: A model of amyloid fibrils formed in apoA-I amyloidosis
Languages of Item:
English
Abstract:
Apolipoprotein A-I (apoA-I) is the major component of high density lipoproteins and plays a vital role
in reverse cholesterol transport. Lipid-free apoA-I is the main constituent of amyloid deposits found
in atherosclerotic plaques, an acquired type of amyloidosis, whereas its N-terminal fragments have
been associated with a hereditary form, known as familial apoA-I amyloidosis. Here, we identified and
verified four “aggregation-prone” segments of apoA-I with amyloidogenic properties, utilizing electron
microscopy, X-ray fiber diffraction, ATR FT-IR spectroscopy and polarized light microscopy. These segments
may act as conformational switches, possibly controlling the transition of the -helical apoA-I
content into the “cross-” architecture of amyloid fibrils. A structural model illuminating the structure
of amyloid fibrils formed by the N-terminal fragments of apoA-I is proposed, indicating that two of the
identified chameleon segments may play a vital part in the formation of amyloid fibrils in familial apoA-I
amyloidosis.
Publication year:
2015
Authors:
Louros, N.N.,
Tsiolaki, P.L.,
Griffin, M.D.,
Howlett, G.J.,
Hamodrakas, S.J.,
Iconomidou, V.A.
Journal:
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Publisher:
Elsevier
Volume:
79
Number:
1
Pages:
711-719
Keywords:
Familial apolipoprotein A-I amyloidosis, “Aggregation-prone” peptide-analogues, Amyloid fibrils
Main subject category:
Archaeology
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