General Western Blot Methods Protocols

For immunoblotting experiments, it is often important to compare the total amount of an antigen from many different sources or to learn if a particular source has the antigen under study.  In the approach described here, tissue cultures, bacteria, yeast cells, tissues, and other sources of antigens are disrupted directly in an electrophoresis sample . - [Read Immunoblotting: Preparing Cell Lysates Protocol]

Protocol describes how proteins are mixed with a sample buffer and prepared for electrophoresis on standard Tris/glycine SDS-polyacrylamide gels. - [Read Immunoblotting: Preparing Protein Solutions Protocol]

The transfer of proteins from a Tris/glycine SDS-polyacrylamide gel to a membrane using a semi-dry method is achieved by placing the gel next to a piece of nitrocellulose filter.  This sandwich is placed directly between two plate electrodes, and the proteins are then transferred from the gel onto the filter. - [Read Immunoblotting: Semi-Dry Electrophoretic Transfer of Proteins from Gels to Membranes Protocol]

Transfer of proteins from a Tris/glycine SDS-polyacrylamide gel to a membrane using the submerged method is achieved by placing the gel next to a piece of nitrocellulose filter, submerging this sandwich in a large volume of transfer buffer in a transfer tank, and running current from one side of the transfer tank to another.  The proteins are then eluted by transferring them from the gel onto the filter. - [Read Immunoblotting: Submerged Electrophoretic Transfer of Proteins from Gels to Membranes Protocol]

This protocol was developed for the BIORAD protein gel and transfer apparatus.  The buffers can be used with any electrophoresis/transfer system. - [Read Western Blot Protocol]