Characterization of a Protein Species Isolated from HeLa Cell Cytoplasm by Affinity Chromatography on Polyadenylate-Sepharose

AUTOR(ES)

Blanchard, J. M.

RESUMO

Chromatography of different soluble extracts from HeLa cells on poly(A)-Sepharose columns has allowed the isolation of a protein fraction eluted by 0.2 M NaCl and localized predominantly in the cytoplasmic supernatant and in the 0.5 M KCl ribosomal wash. This fraction is present in large amounts (around 3% of total cytosolic proteins) and appears to contain a major protein species that is acidic on electrofocusing (pI around 4.5) and phosphorylated. It runs on glycerol gradients and Sephadex G-200 chromatography close to the aldolase marker (158,000 daltons) and dissociates into apparently identical subunits of 38,000 ± 2,000 daltons on sodium dodecyl sulfate-acrylamide gels, suggesting a tetrameric structure.

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