Paul L Foster School of Medicine 1 article published in JoVE Neuroscience Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays Sovanarak Lek1, Javier Vargas-Medrano1, Ernesto Villanueva1, Brian S. Marcus1, Wesley Godfrey1, Ruth G. Perez1 1Department of Biomedical Sciences, Center of Emphasis in Neurosciences, Graduate School of Biomedical Sciences, Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center El Paso This publication presents a protocol showing how to measure the activity of recombinant protein phosphatase 2A catalytic subunit (PP2Ac) in response to recombinant α-synuclein, β-synuclein, or γ-synuclein proteins using a simple colorimetric assay. We show findings regarding α-synuclein specificity toward PP2Ac in mouse brain.