Protein-blotting on XXXX -coated glass-fiber sheets. A basis for acid hydrolysis and gas-phase sequencing of picomole quantities of protein previously separated on @entity3208 / @entity2975 gel.

@entity3208 @entity535 @entity31092 @entity1372 @entity6115 @entity9850 @entity2975 @entity30297
A procedure has been developed which allows the immobilization on glass-fiber sheets coated with the polyquaternary @entity6115 , @entity9850 , of proteins and protein fragments previously separated on @entity3208 -containing @entity2975 gels. The transfer is carried out essentially as has been used for protein blotting on nitrocellulose membranes [Towbin, H., Staehelin, T. and Gordon, J. (1979) Proc. Natl Acad. Sci. USA 76, 4350-4354], but is now used to determine the @entity535 composition and partial sequence of the immobilized proteins. Protein transfer could be carried out after staining the proteins in the gels with Coomassie blue, by which immobilized proteins are visible as blue spots, or without previous staining, after which transferred proteins are detected as fluorescent spots following reaction with @entity30297 . The latter procedure was found to be more efficient and yielded binding capacities of +/- 20 micrograms/cm2. @entity30297 detection was of equal or higher sensitivity than the classical Coomassie staining of proteins in the gel. Immobilized proteins could be hydrolyzed when still present on the glass fiber and reliable @entity535 compositions were obtained for various reference proteins immobilized in less than 100 pmol quantities. In addition, and more importantly, glass-fiber-bound proteins could be subjected to the Edman degradation procedure by simply cutting out the area of the sheet carrying the immobilized protein and mounting the disc in the reaction chamber of the gas-phase sequenator. Results of this immobilization-sequencing technique are shown for immobilized myoglobin (1 nmol) and two proteolytic fragments of actin (+/- 80 pmol each) previously separated on a @entity1372 - @entity31092 -containing gel.
