- WILEY-V C H VERLAG GMBH
2-DE is one of the most powerful methods for analyzing proteins expressed in cells and tissues. Immunodetection of proteins blotted on a polymer membrane is the method of choice for detecting specific proteins in 2-D gels. To precisely locate spots of immunoreactive proteins in 2-D gels, both dye staining and immunodetection were performed on the same PVDF membrane. Prior to immunodetection, nonspecific adsorption of the antibodies to the membrane was blocked with a synthetic polymer-based reagent (N-102) after protein transfer. The protein was then stained with colloidal gold or CBB followed by protein spot identification by LC-MS. Described herein is a method for multiplex analysis of proteins transferred to a PVDF membrane. Proteins that were phosphorylated at tyrosine in the phosphoproteome of rice callus or human ovarian cancer cells were detected by immunoblotting and subsequently identified with high precision.
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