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Amyloid-forming peptides from beta2-microglobulin-Insights into the mechanism of fibril formation in vitro

Jones, Susan, Manning, James, Kad, Neil M, Radford, Sheena E (2003) Amyloid-forming peptides from beta2-microglobulin-Insights into the mechanism of fibril formation in vitro. Journal of molecular biology, 325 (2). pp. 249-257. ISSN 0022-2836. (doi:10.1016/S0022-2836(02)01227-5) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:42952)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL:
http://dx.doi.org/10.1016/S0022-2836(02)01227-5

Abstract

Beta(2)-Microglobulin (beta(2)m) is one of over 20 proteins known to be involved in human amyloid disease. Peptides equivalent to each of the seven beta-strands of the native protein, together with an eighth peptide (corresponding to the most stable region in the amyloid precursor conformation formed at pH 3.6, that includes residues in the native strand E plus the eight succeeding residues (named peptide E')), were synthesised and their ability to form fibrils investigated. Surprisingly, only two sequences, both of which encompass the region that forms strand E in native beta(2)m, are capable of forming amyloid-like fibrils in vitro. These peptides correspond to residues 59-71 (peptide E) and 59-79 (peptide E') of intact beta(2)m. The peptides form fibrils under the acidic conditions shown previously to promote amyloid formation from the intact protein (pH <5 at low and high ionic strength), and also associate to form fibrils at neutral pH. Fibrils formed from these two peptides enhance fibrillogenesis of the intact protein. No correlation was found between secondary structure propensity, peptide length, pI or hydrophobicity and the ability of the peptides to associate into amyloid-like fibrils. However, the presence of a relatively high content of aromatic side-chains correlates with the ability of the peptides to form amyloid fibrils. On the basis of these results we propose that residues 59-71 may be important in the self-association of partially folded beta(2)m into amyloid fibrils and discuss the relevance of these results for the assembly mechanism of the intact protein in vitro.

Item Type: Article
DOI/Identification number: 10.1016/S0022-2836(02)01227-5
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Biosciences
Depositing User: Neil Kad
Date Deposited: 15 Sep 2014 19:06 UTC
Last Modified: 16 Nov 2021 10:17 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/42952 (The current URI for this page, for reference purposes)

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