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Amyloid Fibrils03:03

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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One &#945;-Synuclein Monomer at a Time
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Yet another polymorph of α-synuclein: solid-state sequential assignments.

Julia Gath1, Luc Bousset, Birgit Habenstein

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|October 12, 2013
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Summary
This summary is machine-generated.

Researchers characterized a novel alpha-synuclein (α-synuclein) protein polymorph, crucial for understanding Parkinson's disease proteinopathies. Solid-state NMR revealed distinct structural features compared to previously identified forms.

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Structural Biology

Background:

  • Parkinson's disease is a proteinopathy characterized by protein aggregate accumulation.
  • Alpha-synuclein (α-synuclein) forms amyloid fibrils, a major component of these aggregates.
  • Understanding α-synuclein polymorphs is key to elucidating disease mechanisms.

Purpose of the Study:

  • To structurally characterize a specific α-synuclein polymorph using solid-state NMR.
  • To analyze the secondary structure and identify key residues involved in fibril formation.
  • To compare the findings with previously characterized α-synuclein polymorphs.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy was employed for structural analysis.
  • Chemical shift analysis was performed to determine secondary structure elements.
  • Identification of fibrillar core regions and ordered N-terminal segments.

Main Results:

  • A novel α-synuclein polymorph was characterized, predominantly adopting a β-sheet conformation.
  • The fibrillar core was identified to span residues 38 to 94.
  • Residues 15-20 of the N-terminus were found to form a rigid, ordered β-sheet structure, distinct from other polymorphs.

Conclusions:

  • Solid-state NMR provides insights into the structural diversity of α-synuclein polymorphs.
  • The identified polymorph exhibits unique structural features, including an ordered N-terminal β-sheet.
  • These findings contribute to a deeper understanding of α-synuclein aggregation in Parkinson's disease.