Removal of specific protein spots on the patterns of non-denaturing two-dimensional electrophoresis using protein A agarose and antibodies

Abstract

Protein spots, such as immunoglobulin G (IgG), A (IgA) or alpha 2-macroglobulin, on the patterns of non-denaturing two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) were selectively removed by the application of protein A or antibody-conjugated protein A agarose to the first-dimension gel top at the cathode side. A protein residing at pI 5.8 and with a molecular mass of about 200 kDa was clearly detected when the IgG and IgA spots were removed from the 2-D PAGE pattern.