Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging.
The 42-amino-acid -amyloid (A42) is a critical causative agent in the pathology of Alzheimer’s disease. The hereditary Arctic mutation of A42 (E22G) leads to increased intracellular accumulation of -amyloid in early-onset Alzheimer’s disease. However, it remains largely unknown how the Arctic mutant...
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ftdatacite:10.17863/cam.34805 2023-05-15T14:36:56+02:00 Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. Lu, Meng Williamson, Neil Mishra, Ajay Michel, Claire Kaminski, Clemens Tunnacliffe, Alan Kaminski, Gabriele 2019 https://dx.doi.org/10.17863/cam.34805 https://www.repository.cam.ac.uk/handle/1810/287500 unknown Apollo - University of Cambridge Repository Humans Microscopy, Confocal Microscopy, Fluorescence Protein Conformation Kinetics Mutation Models, Molecular Protein Multimerization Amyloid beta-Peptides Optical Imaging Text Article article-journal ScholarlyArticle 2019 ftdatacite https://doi.org/10.17863/cam.34805 2021-11-05T12:55:41Z The 42-amino-acid -amyloid (A42) is a critical causative agent in the pathology of Alzheimer’s disease. The hereditary Arctic mutation of A42 (E22G) leads to increased intracellular accumulation of -amyloid in early-onset Alzheimer’s disease. However, it remains largely unknown how the Arctic mutant variant leads to aggressive protein aggregation and increased intracellular toxicity. Here, we constructed stable cell lines expressing fluorescent-tagged wildtype (WT) and E22G A42 to study the aggregation kinetics of the Arctic A42 mutant peptide and its heterogeneous structural forms. Arctic-mutant peptides assemble and form fibrils at a much faster rate thanWT peptides. We identified five categories of intracellular aggregate— oligomers, single fibrils, fibril bundles, clusters, and aggresomes—that underline the heterogeneity of these A42 aggregates and represent the progression of A42 aggregation within the cell. Fluorescence-lifetime imaging (FLIM) and 3D structural illumination microscopy (SIM) showed that all aggregate species displayed highly compact structures with strong affinity between individual fibrils. We also found that aggregates formed by Arctic mutant A42 were more resistant to intracellular degradation than theirWT counterparts. Our findings uncover the structural basis of the progression of Arctic mutant A42 aggregation in the cell. : This research was funded by Infinitus (China) Company Ltd, and an Advanced Investigator Award (AdG233232) from the European Research Council to AT; G.S.K.S. acknowledges funding from the Wellcome Trust, the UK Medical Research Council (MRC), and Alzheimer Research UK (ARUK). Text Arctic DataCite Metadata Store (German National Library of Science and Technology) Arctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Humans Microscopy, Confocal Microscopy, Fluorescence Protein Conformation Kinetics Mutation Models, Molecular Protein Multimerization Amyloid beta-Peptides Optical Imaging |
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Humans Microscopy, Confocal Microscopy, Fluorescence Protein Conformation Kinetics Mutation Models, Molecular Protein Multimerization Amyloid beta-Peptides Optical Imaging Lu, Meng Williamson, Neil Mishra, Ajay Michel, Claire Kaminski, Clemens Tunnacliffe, Alan Kaminski, Gabriele Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. |
topic_facet |
Humans Microscopy, Confocal Microscopy, Fluorescence Protein Conformation Kinetics Mutation Models, Molecular Protein Multimerization Amyloid beta-Peptides Optical Imaging |
description |
The 42-amino-acid -amyloid (A42) is a critical causative agent in the pathology of Alzheimer’s disease. The hereditary Arctic mutation of A42 (E22G) leads to increased intracellular accumulation of -amyloid in early-onset Alzheimer’s disease. However, it remains largely unknown how the Arctic mutant variant leads to aggressive protein aggregation and increased intracellular toxicity. Here, we constructed stable cell lines expressing fluorescent-tagged wildtype (WT) and E22G A42 to study the aggregation kinetics of the Arctic A42 mutant peptide and its heterogeneous structural forms. Arctic-mutant peptides assemble and form fibrils at a much faster rate thanWT peptides. We identified five categories of intracellular aggregate— oligomers, single fibrils, fibril bundles, clusters, and aggresomes—that underline the heterogeneity of these A42 aggregates and represent the progression of A42 aggregation within the cell. Fluorescence-lifetime imaging (FLIM) and 3D structural illumination microscopy (SIM) showed that all aggregate species displayed highly compact structures with strong affinity between individual fibrils. We also found that aggregates formed by Arctic mutant A42 were more resistant to intracellular degradation than theirWT counterparts. Our findings uncover the structural basis of the progression of Arctic mutant A42 aggregation in the cell. : This research was funded by Infinitus (China) Company Ltd, and an Advanced Investigator Award (AdG233232) from the European Research Council to AT; G.S.K.S. acknowledges funding from the Wellcome Trust, the UK Medical Research Council (MRC), and Alzheimer Research UK (ARUK). |
format |
Text |
author |
Lu, Meng Williamson, Neil Mishra, Ajay Michel, Claire Kaminski, Clemens Tunnacliffe, Alan Kaminski, Gabriele |
author_facet |
Lu, Meng Williamson, Neil Mishra, Ajay Michel, Claire Kaminski, Clemens Tunnacliffe, Alan Kaminski, Gabriele |
author_sort |
Lu, Meng |
title |
Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. |
title_short |
Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. |
title_full |
Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. |
title_fullStr |
Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. |
title_full_unstemmed |
Structural progression of amyloid-β Arctic mutant aggregation in cells revealed by multiparametric imaging. |
title_sort |
structural progression of amyloid-β arctic mutant aggregation in cells revealed by multiparametric imaging. |
publisher |
Apollo - University of Cambridge Repository |
publishDate |
2019 |
url |
https://dx.doi.org/10.17863/cam.34805 https://www.repository.cam.ac.uk/handle/1810/287500 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_doi |
https://doi.org/10.17863/cam.34805 |
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1766309456840228864 |