title: Two-dimensional maps in very acidic immobilized pH gradients.
abstract: Up to the present time it has been impossible to perform two-dimensional (2-D) separations in very acidic immobilized pH gradients (IPG), due to the lack of suitable buffering acrylamido derivatives to be incorporated into the polyacrylamide matrix. The advent of the pK 3.1 buffer (2-acrylamido glycolic acid; Righetti et al., J. Biochem. Biophys. Methods 16, 1988, 185-192) allowed the formulation of such acidic gradients. We report here separations in IPG pH 2.8-5.0 intervals of polypeptide chains from total lysates of rat intestinal and liver cells and 30S and 50S ribosomal proteins from Halobacterium marismortui. Conditions are given for highly reproducible first and second dimension gels and for a proper silver staining of 2-D maps with practically no background deposition.
authors.affiliation: Institute of Clinical Chemistry and Biochemistry, Freije Universität Berlin, F.R.G.
authors.forename: P K
authors.initials: PK
authors.lastname: Sinha
authors.forename: E
authors.initials: E
authors.lastname: Köttgen
authors.forename: M
authors.initials: M
authors.lastname: Stöffler-Meilicke
authors.forename: E
authors.initials: E
authors.lastname: Gianazza
authors.forename: P G
authors.initials: PG
authors.lastname: Righetti
mesh_terms: D000665:Ampholyte Mixtures; D000818:Animals; D002021:Buffers; D006217:Halobacterium / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007413:Intestinal Mucosa / Q000032:analysis; D007525:Isoelectric Focusing / Q000379:methods*; D008099:Liver / Q000032:analysis; D011506:Proteins / Q000302:isolation & purification*; D051381:Rats; D014020:Tissue Extracts / Q000032:analysis
chemical_list: D000665:Ampholyte Mixtures; D002021:Buffers; D011506:Proteins; D014020:Tissue Extracts