The N-Terminal residues 43 to 60 form the interface for dopamine mediated α-synuclein dimerisation

GREGGIO, Elisa, LEONG, Su Ling, HINDS, Mark G., CONNOR, Andrea R., SMITH, David, ILLES-TOTH, Eva, PHAM, Chi L. L., BARNHAM, Kevin J. and CAPPAI, Roberto (2015). The N-Terminal residues 43 to 60 form the interface for dopamine mediated α-synuclein dimerisation. PLoS ONE, 10 (2), e0116497.

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Abstract

α-synuclein (α-syn) is a major component of the intracellular inclusions called Lewy bodies, which are a key pathological feature in the brains of Parkinson's disease patients. The neurotransmitter dopamine (DA) inhibits the fibrillisation of α-syn into amyloid, and promotes α-syn aggregation into SDS-stable soluble oligomers. While this inhibition of amyloid formation requires the oxidation of both DA and the methionines in α-syn, the molecular basis for these processes is still unclear. This study sought to define the protein sequences required for the generation of oligomers. We tested N- (α-syn residues 43-140) and C-terminally (1-95) truncated α-syn, and found that similar to full-length protein both truncated species formed soluble DA: α-syn oligomers, albeit 1-95 had a different profile. Using nuclear magnetic resonance (NMR), and the N-terminally truncated α-syn 43-140 protein, we analysed the structural characteristics of the DA:α-syn 43-140 dimer and α-syn 43-140 monomer and found the dimerisation interface encompassed residues 43 to 60. Narrowing the interface to this small region will help define the mechanism by which DA mediates the formation of SDS-stable soluble DA:α-syn oligomers.

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Biomedical Research Centre
Identification Number:	https://doi.org/10.1371/journal.pone.0116497
Page Range:	e0116497
Depositing User:	Hilary Ridgway
Date Deposited:	04 Mar 2015 09:38
Last Modified:	18 Mar 2021 07:52
URI:	https://shura.shu.ac.uk/id/eprint/9508

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