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TitleConformational Dynamics of an α-Synuclein Fibril upon Receptor Binding Revealed by Insensitive Nuclei Enhanced by Polarization Transfer-Based Solid-State Nuclear Magnetic Resonance and Cryo-Electron Microscopy.
Journal, issue, pagesJ Am Chem Soc, Vol. 145, Issue 8, Page 4473-4484, Year 2023
Publish dateMar 1, 2023
AuthorsShengnan Zhang / Juan Li / Qianhui Xu / Wencheng Xia / Youqi Tao / Chaowei Shi / Dan Li / ShengQi Xiang / Cong Liu /
PubMed AbstractMany amyloid fibrils associated with neurodegenerative diseases consist of an ordered fibril core (FC) and disordered terminal regions (TRs). The former represents a stable scaffold, while the latter ...Many amyloid fibrils associated with neurodegenerative diseases consist of an ordered fibril core (FC) and disordered terminal regions (TRs). The former represents a stable scaffold, while the latter is rather active in binding with various partners. Current structural studies mainly focus on the ordered FC since the high flexibility of TRs hinders structural characterization. Here, by combining insensitive nuclei enhanced by polarization transfer-based H-detected solid-state NMR and cryo-EM, we explored the intact structure of an α-syn fibril including both FC and TRs and further studied the conformational dynamics of the fibril upon binding to lymphocyte activation gene 3 (LAG3)─a cell surface receptor that is involved in α-syn fibril transmission in brains. We found that both the N- and C-TRs of α-syn are disordered in free fibrils featuring similar conformation ensembles as those in soluble monomers. While in the presence of the D1 domain of LAG3 (L3D1), the C-TR directly binds to L3D1, meanwhile the N-TR folds into a β-strand and further integrates with the FC, which leads to alteration of the overall fibril structure and surface property. Our work reveals synergistic conformational transition of the intrinsically disordered TRs of α-syn, which sheds light on mechanistic understanding of the essential role of TRs in regulating the structure and pathology of amyloid fibrils.
External linksJ Am Chem Soc / PubMed:36794997
MethodsEM (helical sym.)
Resolution2.8 Å
Structure data

33884

7yk2

EMDB-33884, PDB-7yk2:
Cryo-EM structure of Apo-alpha-syn fibril
Method: EM (helical sym.) / Resolution: 2.8 Å

33890

7yk8

EMDB-33890, PDB-7yk8:
Cryo-EM structure of dLAG3-alpha-syn fibril
Method: EM (helical sym.) / Resolution: 2.8 Å

Source
  • homo sapiens (human)
KeywordsPROTEIN FIBRIL / amyloid

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