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Transient small molecule interactions kinetically modulate amyloid beta peptide self-assembly
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för biokemi och biofysik.
Visa övriga samt affilieringar
2012 (Engelska)Ingår i: FEBS Letters, ISSN 0014-5793, E-ISSN 1873-3468, Vol. 586, nr 22, s. 3991-3995Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Small organic molecules, like Congo red and lacmoid, have been shown to modulate the self-assembly of the amyloid beta peptide (A beta). Here, we show that A beta forms NMR invisible non-toxic co-aggregates together with lacmoid as well as Congo red. We find that the interaction involves two distinct kinetic processes and at every given time point only a small fraction of A beta is in the co-aggregate. These weak transient interactions kinetically redirect the aggregation prone A beta from self-assembling into amyloid fibrils. These findings suggest that even such weak binders might be effective as therapeutics against pathogenic protein aggregation.

Ort, förlag, år, upplaga, sidor
2012. Vol. 586, nr 22, s. 3991-3995
Nyckelord [en]
Amyloid, Alzheimer's disease, NMR relaxation dispersion, Dynamic exchange
Nationell ämneskategori
Biokemi och molekylärbiologi
Forskningsämne
biofysik
Identifikatorer
URN: urn:nbn:se:su:diva-83815DOI: 10.1016/j.febslet.2012.09.035ISI: 000310783800010OAI: oai:DiVA.org:su-83815DiVA, id: diva2:577121
Anmärkning

AuthorCount:5;

Tillgänglig från: 2012-12-14 Skapad: 2012-12-14 Senast uppdaterad: 2019-12-12Bibliografiskt granskad
Ingår i avhandling
1. Modulation of amyloid β peptide self-assembly: Aggregation mechanisms associated with Alzheimer's disease
Öppna denna publikation i ny flik eller fönster >>Modulation of amyloid β peptide self-assembly: Aggregation mechanisms associated with Alzheimer's disease
2013 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: Department of Biochemistry and Biophysics, Stockholm University, 2013. s. 22
Nationell ämneskategori
Biofysik
Forskningsämne
biofysik
Identifikatorer
urn:nbn:se:su:diva-89078 (URN)
Presentation
2013-04-09, Magnéli hall, 14:30 (Engelska)
Opponent
Handledare
Tillgänglig från: 2013-04-10 Skapad: 2013-04-10 Senast uppdaterad: 2015-02-23Bibliografiskt granskad
2. Modulation of Alzheimer's amyloid β peptide self-assembly: Insights into molecular mechanisms of peptide aggregation associated with Alzheimer's disease
Öppna denna publikation i ny flik eller fönster >>Modulation of Alzheimer's amyloid β peptide self-assembly: Insights into molecular mechanisms of peptide aggregation associated with Alzheimer's disease
2015 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Misfolding of proteins and peptides is closely linked to several neurodegenerative disorders, among them Alzheimer's disease (AD), the most prominent example of brain diseases. The self-assembly of the amyloid β peptide (Aβ) into amyloid fibrils is one histologic hallmark of AD. A detailed knowledge about the underlying mechanism(s) of Aβ aggregation is crucial for advances toward a fundamental understanding of the disease, which may promote the search for and design of efficient therapeutics. The work presented in this thesis deals with modulation of the aggregation process by various compounds, i.e. small organic molecules (e.g. lacmoid and Congo red), surfactants and metal ions. These results provide insight into the molecular mechanism of modulator interactions and interference with Aβ and its aggregation pathways. Applying a combination of kinetic and dynamic studies as well as structural investigations we characterized the molecular interactions between Aβ and aggregation modulators in terms of microscopic rate constants, conformational preferences and thermodynamics. An important conclusion is that these modulators form highly dynamic complexes with Aβ, with life-times on the timescale of milliseconds. Despite the similar exchange dynamics, the effect on peptide aggregation is modulator-specific and fibril formation can be accelerated, retarded or inhibited by their interactions. In summary, Aβ self-assembly is governed by microscopic kinetic and dynamic processes that can be altered by aggregation modulators. Further elucidation of these mechanisms is beneficial for the understanding and therapeutic intervention of amyloid diseases.

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Biochemistry and Biophysics, Stockholm University, 2015. s. 49
Nationell ämneskategori
Biofysik
Forskningsämne
biofysik
Identifikatorer
urn:nbn:se:su:diva-114172 (URN)978-91-7649-104-1 (ISBN)
Disputation
2015-03-27, Magnéli hall, Arrhenius Laboratory, Svante Arrhenius väg 16 B, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.

Tillgänglig från: 2015-03-05 Skapad: 2015-02-23 Senast uppdaterad: 2019-10-16Bibliografiskt granskad

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Abelein, AxelLang, LisaGräslund, AstridDanielsson, Jens
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Institutionen för biokemi och biofysik
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FEBS Letters
Biokemi och molekylärbiologi

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