Identification of [PtCl2(phen)] Binding Modes in Amyloid-β Peptide and the Mechanism of Aggregation Inhibition
Platinum phenanthroline complexes inhibit amyloid‐β (Aβ) aggregation and reduce Aβ‐caused neurotoxicity [Proc. Natl. Acad. Sci., 2008, 105, 6813–6818]. In this study, we investigated the interactions of Aβ1–16 with [PtCl2(phen)] (phen=1,10‐phenanthroline) using HPLC, ESI‐MS, and NMR spectroscopy , a...
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Published in | Chemistry : a European journal Vol. 17; no. 41; pp. 11657 - 11666 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
04.10.2011
WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | Platinum phenanthroline complexes inhibit amyloid‐β (Aβ) aggregation and reduce Aβ‐caused neurotoxicity [Proc. Natl. Acad. Sci., 2008, 105, 6813–6818]. In this study, we investigated the interactions of Aβ1–16 with [PtCl2(phen)] (phen=1,10‐phenanthroline) using HPLC, ESI‐MS, and NMR spectroscopy , and characterized the identity of products using tandem mass spectrometry. Results indicated that the phenanthroline ligand could induce noncovalent interactions between Aβ peptide and platinum complexes, leading to rapid Aβ platination. Multiple products were generated in the reaction, in which His6/His14 chelation was preferentially formed. Coordination of Asp7, His13, and Lys16 was also detected in other products. The majority of products were monoplatinated adducts with binding of the {Pt(phen)} scaffold, which impeded intermolecular interactions between Aβ peptides. Moreover, noncovalent interactions were confirmed by the interaction between Aβ peptide and [Pt(phen)2]Cl2. The synergistic roles of the phen ligand and platinum(II) atom in the inhibition of Aβ aggregation are discussed.
Crowd control: [PtCl2(phen)] (phen=1,10‐phenanthroline) has a dual role in the inhibition of amyloid‐β (Aβ) aggregation. The phen ligand induces noncovalent interactions between the Aβ peptide and platinum complexes, leading to rapid Aβ platination (see scheme). While multiple products were formed in the reaction, His6/His14 chelation is the most favorable [PtCl2(phen)] binding mode. |
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Bibliography: | Chinese Academy of Sciences istex:46285C3943E767C5D371DAB3946231663BCA869D ArticleID:CHEM201101859 phen=1,10-phenanthroline. NSFC Specialized Research Fund for the Doctoral Program of Higher Education - No. SRFDP 20103402110020 National Natural Science Foundation of China National Basic Research Program of China - No. 973 Program, 2009CB918804 USTC-NSRL Association Funding - No. KY2060190005 ark:/67375/WNG-541TCH21-1 phen=1,10‐phenanthroline. |
ISSN: | 0947-6539 1521-3765 |
DOI: | 10.1002/chem.201101859 |