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Tryptophan probes at the alpha-synuclein and membrane interface.

Candace M Pfefferkorn¹, Jennifer C Lee

¹Laboratory of Molecular Biophysics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.

The Journal of Physical Chemistry. B

|March 17, 2010

Summary

Environmental factors impact alpha-synuclein (alpha-syn) dynamics, crucial for Parkinson's disease. Single tryptophan fluorescence reveals specific interactions of alpha-syn with lipid membranes at key residues.

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Area of Science:

Biochemistry
Neuroscience
Structural Biology

Background:

Alpha-synuclein (alpha-syn) aggregation is linked to Parkinson's disease.
Understanding alpha-syn conformational dynamics is vital for Parkinson's disease research.

Purpose of the Study:

To investigate how environmental factors influence alpha-syn conformational dynamics.
To map the interaction sites of alpha-syn with lipid membranes.

Main Methods:

Single tryptophan fluorescence spectroscopy (steady-state and time-resolved).
Circular dichroism spectroscopy.
Utilized single tryptophan-containing alpha-syn variants.

Main Results:

Distinct phospholipid vesicle and micelle interactions observed at alpha-syn residues 4, 39, 94, and 125.
Trp mutations did not alter membrane binding properties (Kaapp ≈ 1 x 10^7 M⁻¹).
Residues 4 and 94 showed the highest sensitivity to the lipid bilayer, with significant spectral shifts and quantum yield increases.

Conclusions:

Alpha-syn exhibits specific interactions with lipid membranes at distinct residue positions.
These findings provide insights into the environmental modulation of alpha-syn structure relevant to Parkinson's disease pathogenesis.