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Related Concept Videos

Amyloid Fibrils03:03

Amyloid Fibrils

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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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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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SNAREs and Membrane Fusion01:43

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Related Experiment Video

Updated: May 4, 2026

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One &#945;-Synuclein Monomer at a Time
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Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time

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Structural and dynamical insights into the membrane-bound α-synuclein.

Neha Jain1, Karishma Bhasne1, M Hemaswasthi2

  • 1Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, India.

Plos One
|December 31, 2013
PubMed
Summary
This summary is machine-generated.

This study reveals how alpha-synuclein (α-synuclein) changes structure on lipid membranes, offering insights into neuronal function and Parkinson's disease (PD). Site-specific fluorescence mapping precisely details protein-membrane interactions.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Structural Biology

Background:

  • Alpha-synuclein (α-synuclein) is a presynaptic protein linked to neuronal functions and Parkinson's disease (PD).
  • Understanding α-synuclein's structural changes on lipid membranes is crucial for elucidating its role in health and disease.

Purpose of the Study:

  • To gain residue-specific structural insights into membrane-bound α-synuclein.
  • To characterize the conformational rearrangements and dynamics of α-synuclein on lipid bilayers.

Main Methods:

  • Incorporation of single tryptophan residues as site-specific fluorescent probes.
  • Utilizing fluorescence readouts: spectral-shift, quenching efficiency, anisotropy, and red-edge excitation shift (REES).
  • Constructing a dynamic hydration map of α-synuclein on negatively charged lipid vesicles.

Main Results:

  • Fluorescence data revealed distinct conformational changes at various α-synuclein locations on the membrane.
  • REES identified residues at the membrane-water interface, defining a layer of restrained water molecules.
  • The study successfully mapped protein hydration and distinguished structural alterations on different lipid types.

Conclusions:

  • Site-specific fluorescence provides a model-free approach to unravel α-synuclein's molecular details on membranes.
  • Structural modulations of α-synuclein on membranes may relate to its physiological roles and Parkinson's disease pathogenesis.
  • The methodology can differentiate subtle structural changes of α-synuclein interacting with various negatively charged lipids.