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A simple and rapid procedure for preparation of proteins for manual microsequencing using sodium dodecyl sulfate gel electrophoresis is described. The procedure involves pre-electrophoretic labeling of the protein amino groups with a coloured Edman reagent, disk electrophoresis for purification or fractionation of the proteins, and reversed electrophoretic transfer of the separated protein from gel slices into a small volume of buffer (100 to 150 microliter) using a discontinuous conductivity gradient to recover the proteins. The pre-electrophoretic labeling facilitates location of the separated proteins in the gel and the monitoring of their complete electroelution. The isolated proteins are separated from excess of salts by acetone precipitation and solvent partitioning in pyridine/water (1:1) and subjected to manual DABITC/PITC degradation.

Manual N-Terminal Microsequencing of Proteins Electroeluted from Polyacrylamide Gel Slices