Abstract
A method is described which combines the resolving power of two-dimensional gel electrophoresis with that of acetic acid/urea/Triton X-100 gel electrophoresis, avoiding the necessity of eluting protein from the gels at any step of the procedure. The combination of electrophoretic separation on the basis of charge, mass, and hydrophobic properties of the proteins has the potential of resolving modified forms and isoforms present in very complex protein populations. The technique can be used for analytical purposes, or it may be scaled up to yield microgram amounts of highly purified proteins. The resolution obtained by tandem application of nonequilibrium pH gradient electrophoresis, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and polyacrylamide gel electrophoresis in the presence of nonionic detergent was evaluated using crude nuclear proteins of the nematode Caenorhabditis elegans.
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