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Abstract: α-Synuclein is involved in Parkinson's disease and its interaction with cell membrane is crucial to its pathological and physiological functions. Membrane properties, such as curvature and lipid composition, have been shown to affect the interactions by various techniques, but ion effects on α-synuclein membrane interactions remain elusive. Ca2+ dynamic fluctuation in neurons plays important roles in the onset of Parkinson's disease and its influx is considered as one of the reasons to cause cell death. Using solution Nuclear Magnetic Resonance (NMR) spectroscopy, here we show that Ca2+ can modulate α-synuclein membrane interactions through competitive binding to anionic lipids, resulting in dissociation of α-synuclein from membranes. These results suggest a negative modulatory effect of Ca2+ on membrane mediated normal function of α-synuclein, which may provide a clue, to their dysfunction in neurodegenerative disease. [Copyright &y& Elsevier]