title: Interaction between Abeta peptide and alpha synuclein: molecular mechanisms in overlapping pathology of Alzheimer's and Parkinson's in dementia with Lewy body disease.
abstract: Amyloidogenic proteins (Abeta peptide) in Alzheimer's disease (AD) and alpha-synuclein (alpha-Syn) in Parkinson's disease (PD) are typically soluble monomeric precursors, which undergo remarkable conformational changes and culminate in the form of aggregates in diseased condition. Overlap of clinical and neuropathological features of both AD and PD are observed in dementia with Lewy body (DLB) disease, the second most common form of dementia after AD. The identification of a 35-amino acid fragment of alpha-Syn in the amyloid plaques in DLB brain have raised the possibility that Abeta and alpha-Syn interact with each other. In this report, the molecular interaction of alpha-Syn with Abeta40 and/or Abeta42 are investigated using multidimensional NMR spectroscopy. NMR data in the membrane mimic environment indicate specific sites of interaction between membrane-bound alpha-Syn with Abeta peptide and vice versa. These Abeta-alpha-Syn interactions are demonstrated by reduced amide peak intensity or change in chemical shift of amide proton of the interacting proteins. Based on NMR results, the plausible molecular mechanism of overlapping pathocascade of AD and PD in DLB due to interactions between alpha-Syn and Abeta is described. To the best of our knowledge, it is the first report using multidimensional NMR spectroscopy that elucidates molecular interactions between Abeta and alpha-Syn which may lead to onset of DLB.
authors.affiliation: Department of Psychiatry, Western Psychiatric Institute and Clinic, University of Pittsburgh Medical Center, 3811 O'Hara Street, Pittsburgh, PA 15213, USA. mandalp@upmc.edu
authors.forename: Pravat K
authors.initials: PK
authors.lastname: Mandal
authors.forename: Jay W
authors.initials: JW
authors.lastname: Pettegrew
authors.forename: Eliezer
authors.initials: E
authors.lastname: Masliah
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Hamilton
authors.forename: Ratna
authors.initials: R
authors.lastname: Mandal
mesh_terms: D000544:Alzheimer Disease / Q000473:pathology* / Q000503:physiopathology; D000595:Amino Acid Sequence; D016229:Amyloid beta-Peptides / Q000235:genetics / Q000378:metabolism*; D001921:Brain / Q000166:cytology / Q000378:metabolism / Q000473:pathology; D006801:Humans; D020961:Lewy Body Disease / Q000473:pathology* / Q000503:physiopathology; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D010300:Parkinson Disease / Q000473:pathology* / Q000503:physiopathology; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism*; D051844:alpha-Synuclein / Q000235:genetics / Q000378:metabolism*
chemical_list: D016229:Amyloid beta-Peptides; D010446:Peptide Fragments; D051844:alpha-Synuclein