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Fibrils with parallel in-register structure constitute a major class of amyloid fibrils: molecular insights from electron paramagnetic resonance spectroscopy

Published online by Cambridge University Press:  11 December 2008

Martin Margittai  and
Ralf Langen
Martin Margittai*
Affiliation:
Department of Chemistry and Biochemistry, University of Denver, Denver, CO, USA
Ralf Langen*
Affiliation:
Department of Biochemistry and Molecular Biology, Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
*
*Authors for correspondence: Dr. M. Margittai, Department of Chemistry and Biochemistry, University of Denver, Denver, CO80208, USA. Tel.: 303-871-4135; Fax: 303-871-2254; Email: martin.margittai@du.edu
Dr. R. Langen, Department of Biochemistry and Molecular Biology, Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA90033, USA. Tel.: 323-442-1323; Fax: 323-442-4404; Email: langen@usc.edu
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Abstract

The deposition of amyloid- and amyloid-like fibrils is the main pathological hallmark of numerous protein misfolding diseases including Alzheimer's disease, transmissible spongiform encephalopathy, and type 2 diabetes. Besides the well-established role in disease, recent work on a variety of organisms ranging from bacteria to humans suggests that amyloid fibrils can also convey biological functions. To better understand the molecular mechanisms by which amyloidogenic proteins misfold in disease or perform biological functions, structural information is essential. Although high-resolution structural analysis of amyloid fibrils has been challenging, a combination of biophysical approaches is beginning to unravel the various structural features of amyloid fibrils. Here we review these recent developments with particular emphasis on amyloid fibrils that have been studied using site-directed spin labeling and electron paramagnetic resonance spectroscopy. This approach has been used to define the precise location of fibril-forming core regions and identify local secondary structures within such core regions. Perhaps one of the most remarkable findings arrived at by site-directed spin labeling was that most fibrils that contain an extensive core region of ∼20 amino acids or more share a common parallel in-register arrangement of β strands. The preference for this arrangement can be explained on topological grounds and may be rationalized by the maximization of hydrophobic contact surface.

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Type
Review Article
Information
Quarterly Reviews of Biophysics , Volume 41 , Issue 3-4 , November 2008 , pp. 265 - 297
Copyright
Copyright © 2008 Cambridge University Press

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