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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Aerts, Maarten Petrovski, Goran Nemes, Zoltán Fésüs, László Sergeant, Kjell Devreese, Bart |
| Description | Author Affiliation: Nemes Z ( Department of Psychiatry, Signaling and Apoptosis Research Group, Hungarian Academy of Sciences, Research Center for Molecular Medicine, University of Debrecen, Debrecen H-4012, Hungary. znemes@dote.hu) |
| Abstract | The alpha-synuclein immunopositive and chaotrope-insoluble material from human brains with Lewy body pathology was analyzed by mass spectrometry. From the proteinase K-cleavable peripheral fraction of Lewy bodies, which was densely cross-linked by gamma-glutamyl-epsilon-lysine bonds between HspB1 and ubiquitin in a pattern similar to neurofibrillary tangles (Nemes, Z., Devreese, B., Steinert, P. M., Van Beeumen, J., and Fésüs, L. (2004) FASEB J. 18, 1135-1137), 53 proteins were identified. In the core of Lewy bodies only alpha-synuclein was found, and it contained a low amount of intramolecular cross-links between Gln-99 and Lys-58. In vitro cross-linking of alpha-synuclein by transglutaminases 1-3 and 5 produced a heterogeneous population of variably cross-linked alpha-synucleins in solution, which inhibited the aggregation of the protein into amyloid. However, in the presence of phosphatidylserine-rich membranes and micromolar calcium concentrations, the cross-linking by transglutaminases 1, 2, and 5 showed specificity toward the utilization of Gln-99 and Lys-58. As shown by thioflavin T fluorescence monitoring, the formation of this cross-link accelerated the aggregation of native alpha-synuclein. Chemical cross-linking of residues 58-99 triggered amyloid formation, whereas such bonding of residues 99 to 10 was inhibitory. Our findings reveal the pivotal role of membrane attachment and transglutaminase-mediated intermolecular cross-linking for the propagative misfolding and aggregation of alpha-synuclein. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 40 |
| Volume Number | 284 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2009-10-02 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amyloid Metabolism Cell Membrane Lewy Bodies Transglutaminases Alpha-Synuclein Chemistry Amino Acid Sequence Animals Brain Cytology Pathology Cross-Linking Reagents Pharmacology Dipeptides Endopeptidase K Molecular Sequence Data Solubility Ubiquitin Isolation & Purification Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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