“…Protein samples were mixed 3:1 with a 4Ă loading buffer (250 mM TrisâHCl, 8% SDS, 40% glycerol, and 0.04% bromophenol blue, pH 6.8) optionally supplemented with 20 mM dithiothreitol (Merck) to arrive at nonâreducing and reducing conditions, respectively, and then subjected to 10â12% SDSâPAGE in running buffer (25 mM TrisâHCl, 192 mM glycine, and 0.1% SDS, pH 8.2). Silver staining and colloidal Coomassie Gâ250 staining were carried out for visualization of the protein bands as described (Chevallet et al , 2006; Dyballa & Metzger, 2009).…”