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Nat Struct Biol. 2002 May;9(5):332-6.

Mapping the core of the beta(2)-microglobulin amyloid fibril by H/D exchange.

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Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan.


Despite numerous efforts, the lack of detailed structural information on amyloid fibrils has hindered clarification of the mechanism of their formation. Here, we describe a novel procedure for characterizing the conformational flexibility of beta(2)-microglobulin amyloid fibrils at single-residue resolution that uses H/D exchange of amide protons combined with NMR analysis. The results indicate that most residues in the middle region of the molecule, including the loop regions in the native structure, form a rigid beta-sheet core, whereas the the N- and C-termini are excluded from this core. The extensively hydrogen-bonded beta-sheet core explains the remarkable rigidity and stability of amyloid fibrils. The present method could be used to obtain residue-specific conformational information of various amyloid fibrils, even though it does not provide a high resolution three-dimensional structure.

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