title: [Isolation of the protein B23/nucleophosmin from HeLa cell nuclei].
abstract: Endogenous forms of the protein B23 were for the first time isolated from HeLa cell nuclei and their structural states were analyzed. It was demonstrated that incubation of HeLa cell nuclei in 10 mM Tris-HCl buffer (pH 7.4) led, not only to their swelling, but also to the release of several nuclear proteins, including the protein B23. PAGE of the supernatant fraction allowed nine major stained protein bands to be detected; the bands were identified by MALDI mass spectrometry (matrix-assisted laser desorption and ionization). The proteins in the range of 35-40 kDa were identified as nucleophosmin, glyceraldehyde 3-phosphate dehydrogenase (GAPDH), and heterogeneous nuclear ribonucleoprotein (hnRNP) A2/B1. Analysis of the N- and C-terminal amino acid sequences showed the presence of the isoforms B23.1 and B23.2, GAPDH, and the isoform hnRNP B1 and made it possible to describe the C- and N- terminal processing patterns and demonstrate the presence of isoform B23.2 at a protein level.
authors.forename: E N
authors.initials: EN
authors.lastname: Sautkina
authors.forename: N A
authors.initials: NA
authors.lastname: Potapenko
authors.forename: T I
authors.initials: TI
authors.lastname: Bulycheva
authors.forename: N M
authors.initials: NM
authors.lastname: Vladimirova
mesh_terms: D002467:Cell Nucleus / Q000737:chemistry*; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D006367:HeLa Cells; D006801:Humans; D009687:Nuclear Proteins / Q000737:chemistry / Q000302:isolation & purification*; D000090243:Nucleophosmin; D020033:Protein Isoforms / Q000737:chemistry / Q000302:isolation & purification; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods
chemical_list: C000716967:NPM1 protein, human; D009687:Nuclear Proteins; D020033:Protein Isoforms; D000090243:Nucleophosmin