Abstract
Alpha-synuclein is a presynaptic protein, the A53T and A30P mutants of which are linked independently to early-onset familial Parkinson's disease. The association of wild-type alpha-synuclein with lipid membranes was characterized previously by electron spin resonance (ESR) spectroscopy with spin-labeled lipids [Ramakrishnan, M., Jensen, P. H., and Marsh, D. (2003) Biochemistry 42, 12919-12926]. Here, we study the interaction of the A53T and A30P alpha-synuclein mutants and a truncated form that lacks the acidic C-terminal domain with phosphatidylglycerol bilayer membranes, using anionic phospholipid spin labels. The strength of the interaction with phosphatidylglycerol membranes lies in the order: wild type approximately truncated > A53T > A30P > fibrils approximately 0, and only the truncated form interacts with phosphatidylcholine membranes. The selectivity of the interaction of the mutant alpha-synucleins with different spin-labeled lipid species is reduced considerably, relative to the wild-type protein, whereas that of the truncated protein is increased. Polarized infrared (IR) spectroscopy is used to study the interactions of the wild-type and truncated proteins with aligned lipid membranes and additionally to characteri...Continue Reading
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