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000808413 245__ $$aMonomeric Amyloid Beta Peptide in Hexafluoroisopropanol Detected by Small Angle Neutron Scattering
000808413 260__ $$aLawrence, Kan.$$bPLoS$$c2016
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000808413 520__ $$aSmall proteins like amyloid beta (Aβ) monomers are related to neurodegenerative disorders by aggregation to insoluble fibrils. Small angle neutron scattering (SANS) is a nondestructive method to observe the aggregation process in solution. We show that SANS is able to resolve monomers of small molecular weight like Aβ for aggregation studies. We examine Aβ monomers after prolonged storing in d-hexafluoroisopropanol (dHFIP) by using SANS and dynamic light scattering (DLS). We determined the radius of gyration from SANS as 1.0±0.1 nm for Aβ1–40 and 1.6±0.1 nm for Aβ1–42 in agreement with 3D NMR structures in similar solvents suggesting a solvent surface layer with 5% increased density. After initial dissolution in dHFIP Aβ aggregates sediment with a major component of pure monomers showing a hydrodynamic radius of 1.8±0.3 nm for Aβ1–40 and 3.2±0.4 nm for Aβ1–42 including a surface layer of dHFIP solvent molecules.
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000808413 7001_ $$0P:(DE-Juel1)130542$$aBiehl, Ralf$$b1$$eCorresponding author
000808413 7001_ $$0P:(DE-Juel1)162443$$aNagel-Steger, Luitgard$$b2
000808413 7001_ $$0P:(DE-Juel1)130905$$aRadulescu, Aurel$$b3
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