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Title: Protective spin-labeled fluorenes maintain amyloid beta peptide in small oligomers and limit transitions in secondary structure

Abstract

Alzheimer's disease is characterized by the presence of extracellular plaques comprised of amyloid beta (Aβ) peptides. Soluble oligomers of the Aβ peptide underlie a cascade of neuronal loss and dysfunction associated with Alzheimer's disease. Here, single particle analyses of Aβ oligomers in solution by fluorescence correlation spectroscopy (FCS) were used to provide real-time descriptions of how spin-labeled fluorenes (SLFs; bi-functional small molecules that block the toxicity of Aβ) prevent and disrupt oligomeric assemblies of Aβ in solution. Furthermore, the circular dichroism (CD) spectrum of untreated Aβ shows a continuous, progressive change over a 24-hour period, while the spectrum of Aβ treated with SLF remains relatively constant following initial incubation. These findings suggest the conformation of Aβ within the oligomer provides a complementary determinant of Aβ toxicity in addition to oligomer growth and size. Although SLF does not produce a dominant state of secondary structure in Aβ, it does induce a net reduction in beta secondary content compared to untreated samples of Aβ. The FCS results, combined with electron paramagnetic resonance spectroscopy and CD spectroscopy, demonstrate SLFs can inhibit the growth of Aβ oligomers and disrupt existing oligomers, while retaining Aβ as a population of smaller, yet largely disordered oligomers.

Authors:
 [1];  [2];  [1];  [1];  [3];  [4];  [4];  [3];  [1];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Biochemistry and Molecular Medicine
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Science Directorate
  3. Univ. of California Davis, Sacramento, CA (United States). MIND Inst. and Dept. of Pathology and Laboratory Medicine
  4. Univ. of Pecs (Hungary). Inst. of Organic and Medicinal Chemistry
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE; National Institutes of Health (NIH); Hungarian Research Fund
OSTI Identifier:
1252634
Report Number(s):
LLNL-JRNL-663395-DRAFT
Journal ID: ISSN 1570-9639
Grant/Contract Number:  
AC52-07NA27344; P30 AG010129; OTKA 104956
Resource Type:
Accepted Manuscript
Journal Name:
Biochimica et Biophysica Acta. Proteins and Proteomics
Additional Journal Information:
Journal Volume: 1854; Journal Issue: 12; Journal ID: ISSN 1570-9639
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Amyloid beta; Oligomer; Spin-labeled fluorene; Secondary structure; Fluorescence correlation spectroscopy; Circular dichroism spectroscopy

Citation Formats

Altman, Robin, Ly, Sonny, Hilt, Silvia, Petrlova, Jitka, Maezawa, Izumi, Kálai, Tamás, Hideg, Kálmán, Jin, Lee-Way, Laurence, Ted A., and Voss, John C. Protective spin-labeled fluorenes maintain amyloid beta peptide in small oligomers and limit transitions in secondary structure. United States: N. p., 2015. Web. doi:10.1016/j.bbapap.2015.09.002.
Altman, Robin, Ly, Sonny, Hilt, Silvia, Petrlova, Jitka, Maezawa, Izumi, Kálai, Tamás, Hideg, Kálmán, Jin, Lee-Way, Laurence, Ted A., & Voss, John C. Protective spin-labeled fluorenes maintain amyloid beta peptide in small oligomers and limit transitions in secondary structure. United States. https://doi.org/10.1016/j.bbapap.2015.09.002
Altman, Robin, Ly, Sonny, Hilt, Silvia, Petrlova, Jitka, Maezawa, Izumi, Kálai, Tamás, Hideg, Kálmán, Jin, Lee-Way, Laurence, Ted A., and Voss, John C. Mon . "Protective spin-labeled fluorenes maintain amyloid beta peptide in small oligomers and limit transitions in secondary structure". United States. https://doi.org/10.1016/j.bbapap.2015.09.002. https://www.osti.gov/servlets/purl/1252634.
@article{osti_1252634,
title = {Protective spin-labeled fluorenes maintain amyloid beta peptide in small oligomers and limit transitions in secondary structure},
author = {Altman, Robin and Ly, Sonny and Hilt, Silvia and Petrlova, Jitka and Maezawa, Izumi and Kálai, Tamás and Hideg, Kálmán and Jin, Lee-Way and Laurence, Ted A. and Voss, John C.},
abstractNote = {Alzheimer's disease is characterized by the presence of extracellular plaques comprised of amyloid beta (Aβ) peptides. Soluble oligomers of the Aβ peptide underlie a cascade of neuronal loss and dysfunction associated with Alzheimer's disease. Here, single particle analyses of Aβ oligomers in solution by fluorescence correlation spectroscopy (FCS) were used to provide real-time descriptions of how spin-labeled fluorenes (SLFs; bi-functional small molecules that block the toxicity of Aβ) prevent and disrupt oligomeric assemblies of Aβ in solution. Furthermore, the circular dichroism (CD) spectrum of untreated Aβ shows a continuous, progressive change over a 24-hour period, while the spectrum of Aβ treated with SLF remains relatively constant following initial incubation. These findings suggest the conformation of Aβ within the oligomer provides a complementary determinant of Aβ toxicity in addition to oligomer growth and size. Although SLF does not produce a dominant state of secondary structure in Aβ, it does induce a net reduction in beta secondary content compared to untreated samples of Aβ. The FCS results, combined with electron paramagnetic resonance spectroscopy and CD spectroscopy, demonstrate SLFs can inhibit the growth of Aβ oligomers and disrupt existing oligomers, while retaining Aβ as a population of smaller, yet largely disordered oligomers.},
doi = {10.1016/j.bbapap.2015.09.002},
journal = {Biochimica et Biophysica Acta. Proteins and Proteomics},
number = 12,
volume = 1854,
place = {United States},
year = {Mon Sep 14 00:00:00 EDT 2015},
month = {Mon Sep 14 00:00:00 EDT 2015}
}

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A Bifunctional Anti-Amyloid Blocks Oxidative Stress and the Accumulation of Intraneuronal Amyloid-Beta
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