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Aβ(39–42) Modulates Aβ Oligomerization but Not Fibril Formation

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Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
Department of Physics, University of California at Santa Barbara, Santa Barbara, California 93106, United States
§ ∥ ⊥ §Department of Neurology, David Geffen School of Medicine, Brain Research Institute, and Molecular Biology Institute, University of California at Los Angeles, Los Angeles, California 90095, United States
*Phone: 805-893-2893. Fax: 805-893-8703. E-mail: [email protected]
Cite this: Biochemistry 2012, 51, 1, 108–117
Publication Date (Web):November 30, 2011
Copyright © 2011 American Chemical Society

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    Recently, certain C-terminal fragments (CTFs) of Aβ42 have been shown to be effective inhibitors of Aβ42 toxicity. Here, we examine the interactions between the shortest CTF in the original series, Aβ(39–42), and full-length Aβ. Mass spectrometry results indicate that Aβ(39–42) binds directly to Aβ monomers and to the n = 2, 4, and 6 oligomers. The Aβ42:Aβ(39–42) complex is further probed using molecular dynamics simulations. Although the CTF was expected to bind to the hydrophobic C-terminus of Aβ42, the simulations show that Aβ(39–42) binds at several locations on Aβ42, including the C-terminus, other hydrophobic regions, and preferentially in the N-terminus. Ion mobility–mass spectrometry (IM-MS) and electron microscopy experiments indicate that Aβ(39–42) disrupts the early assembly of full-length Aβ. Specifically, the ion-mobility results show that Aβ(39–42) prevents the formation of large decamer/dodecamer Aβ42 species and, moreover, can remove these structures from solution. At the same time, thioflavin T fluorescence and electron microscopy results show that the CTF does not inhibit fibril formation, lending strong support to the hypothesis that oligomers and not amyloid fibrils are the Aβ form responsible for toxicity. The results emphasize the role of small, soluble assemblies in Aβ-induced toxicity and suggest that Aβ(39–42) inhibits Aβ-induced toxicity by a unique mechanism, modulating early assembly into nontoxic hetero-oligomers, without preventing fibril formation.

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    Additional ion mobility data of Aβ:CTF mixtures, starting structures for the MD simulations, and representative structures of the Aβ:CTF complexes from the most populated structural families. This material is available free of charge via the Internet at

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